What if the computer doesn't restart?

Automatic restart failure analysis and resolution




Analysis and solution of
automatic restart fault





, Software,





1, Virus > "shock wave" virus outbreak also prompts the system will automatically start in 60 seconds.


Trojan programs remotely control all your computer's activities, including getting your computer restarted.


remove viruses, trojans, or reload systems





2, System files damaged system files are corrupted, such as Win2K under the Kernel32.dll,win98 fonts directory, such as the font of the system runtime basic files are destroyed, the system will not complete initialization and forced reboot.


Workaround: Override installation or reinstall.


3, timing software or scheduled task software works


If you set up a restart or load some of your work programs in the "plan taskbar", the computer will start again when the timing comes. In this case, we can open the "Start" item, check that there are not familiar with their own execution files or other timed work procedures, shielding them and then power-on check. Of course, we can also enter the "Msconfig" command directly in "Run" to select the startup item








II, Hardware





1, the chassis power supply is not enough, DC output is not pure, dynamic unresponsive. Users or installed business often do not attach importance to the power supply, the use of low-cost power supply, which is causing the system to automatically restart one of the biggest suspicion (1) power output power is insufficient, when running large 3D games, such as CPU resources larger software, CPU needs high-power power supply, power supply is not enough overload caused by power protection, Stops the output. When the power is off, the load is reduced and the power supply starts again. Because the protection/recovery time is very short, so give us the performance is the host automatic restart. (2) The power supply DC output is not pure, the digital circuit requires pure DC power supply, when the power supply of the DC output of the harmonic content is too large, it will lead to digital circuit work error, the performance is a recurrent crash or restart. (3) CPU workload is dynamic, the requirements of the current is also dynamic, but also requires rapid dynamic response speed. Some poor quality power supply dynamic response time is long, will also lead to frequent panic or reboot. (4) Update equipment (high-end graphics/large hard disk/video card), the increase of equipment (burner/hard disk), power beyond the original power of the rated output power will cause frequent panic or restart.





solution: Now for high-quality high-power computer power.





2, bad memory thermal stability, chip damage or set error


memory problems cause the system to restart the system to restart the probability of relatively large. (1) Bad memory thermal stability, boot can work, when the memory temperature rise to a certain temperature, it will not work properly, resulting in a panic or restart. (2) The memory chip is slightly damaged, the boot can pass self-test, also can enter the system, when running some large throughput software will restart or panic. Workaround: Replace the memory.


(3) Setting the CAS value of the memory too small can also cause memory instability, causing the system to automatically restart. It is generally preferable to use the BIOS default settings and do not change them yourself.








3, CPU temperature is too high or cache damage





1 CPU temperature is too high often cause protective automatic restart. The reason is too high temperature is due to the chassis, CPU heat dissipation, the cause of poor CPU heat dissipation: heat sink material heat conductivity low, radiator and CPU interface between the foreign body (many for quality assurance posts), fan speed is low, fan and radiator dust too much and so on. There are P2, P3 motherboard CPU under the temperature probe damaged or P4 CPU internal temperature measurement circuit damage, the motherboard on the BIOS bug in a special condition of the temperature is not allowed, CMOS set the CPU protection temperature is too low, etc. will also cause a protective reboot.


(2) CPU internal secondary cache corruption is a common CPU failure. The degree of light damage, or can be started, into the system, when running some high-volume software (media playback, games, flat 3D drawing) will restart or panic.


WORKAROUND: Block level two cache (L2) or first-level caching (L1) or replace CPU exclusions in CMOS.





4, AGP graphics card, PCI card (network card, cat) caused by automatic restart


(1) External card work non-standard or poor quality, triggering the reset signal AGP/PCI Bus error action led to system restart.


(2) also has the video card, the network card loose causes the system to restart the case.





5, the same port, serial port, USB interface access to faulty or incompatible external devices automatically restart <


1 peripherals are faulty or incompatible, such as the printer's mouth damage, a foot to the ground short-circuit, USB equipment damage to the ground short-circuit, pin definition, signal level is not compatible and so on. <


2 hot Plug external equipment, jitter is too large, causing a signal or power supply instantaneous short circuit.





6, the optical drive internal circuit or chip damage to the optical drive, most of the performance is unable to read disk/engraved plate. It is also due to internal circuit or chip damage caused the host in the process of a sudden restart. The optical drive itself is poorly designed and fireware with bugs. Also causes a reboot when the disc is read.





7, chassis front panel reset switch problem > chassis front panel Reset key is actually a normally open switch, the reset signal on the motherboard is V level signal, connected to reset switch. When the switch closes, the V level to the ground conduction, the signal level down to 0V, triggering the system reset reset, reset switch back to the normal position, at this time reset signal back to the V level. If the reset key is damaged, the switch is always in the closed position, the reset signal is 0V, the system can not be put on the self-test.


when the reset switch is less elastic and the button is not easy to bounce, the switch will appear slightly vibrating and easy to close. Which causes the system reset to reboot.


solution: Replace reset switch. The reset switch leads short circuit in the organic box, which causes the host to restart automatically





8, motherboard failure: The case of the motherboard causing automatic restart is rare. It is usually related to reset circuit fault, socket, socket has virtual welding, poor contact, individual chips, capacitors and other components damage.





Third, other reasons


1, mains voltage instability


1 The switching power supply voltage range of the computer is generally 170v-240v, when the mains voltage is below 170V, the computer will automatically restart or shutdown.


Solution: Add voltage regulator (not UPS) or 130-260v wide switching power supply


2 computer and air-conditioning, refrigerators and other large power consumption of a strips words, in these electrical start-up, the supply of computer voltage will be greatly affected, often performance for the system restart.

The
solution is to separate their power lines





2, strong magnetic interference


do not underestimate electromagnetic interference, many times our computer crashes and reboots due to interference, both from the internal chassis CPU fans, chassis fans, graphics fans, graphics cards, motherboards, hard disk interference, but also from the external power line, inverter air-conditioning and even large equipment such as automobiles interference. If our host interference performance or poor shielding, there will be a host of accidental restart or frequent crash of the phenomenon


3, AC power line connected to the wrong users of the power supply line 0 Direct grounding (do not go to the 0 line of Watt-hour meter), resulting in automatic restart, because from the ground to introduce interference signal


4, plug or outlet quality is poor, contact bad. Power sockets in the use of a period of time, the elasticity of the reed slowly lost, causing the plug and reed contact between the bad, resistance constantly changing, the ups and downs, the system will naturally be very unstable, once the current can not reach the minimum operating system requirements, the computer will restart. Solution, purchase quality clearance good socket





5, accumulated dust too much caused the motherboard reset line short-circuit caused by automatic restart.





Four, some examples


1, CPU two-level cache bad instance


a 865PE-NEO2,P4 2.8c,kingmax ddr400,windows XP system. Automatically restart when playing games, replace memory, video card, power failure still. Turn off level two cache in BIOS, run slowly, but do not reboot automatically, then replace CPU (P4 3.0e) troubleshooting. Finally the CPU returns to the factory.


a KT4AV,AMD xp1800+,ddr333,windows XP system. Can not enter the system, one to XP boot screen automatically restart, replace memory, graphics, power failure is still. Enter the BIOS and the CPU level two cache shutdown, save the reboot after the exit, you can normally enter the system. Finally swap the CPU for troubleshooting.


2, the example of power failure; Two compatible machines, one CPU for Athlon XP 1800+, one CPU for P4 2.0GHz, power supply for Century star. Automatically restarts when the computer is running at full load for a period of time. Usually used for document editing, Internet and other general work normally, only a large number of calculations before the problem. Suspected that the CPU temperature is too high, the test indicates that the temperature is normal. Replacement memory, video card failure remains. In addition, check the hard drive found, one of the hard drive appeared bad, replace the hard drive reload system after the failure remains. Hard drive failure is basically caused by bad power. Then replaced by air ka calm queen, failure disappeared.


3, video card contact Bad example


One configuration for the 845PE neo-l motherboard, P4 2.0G CPU, 80G hard disk, xiaoying PA 5200 graphics compatibility machine, because moving, reconnect, post normal, after the motherboard logo, the Windows XP splash screen, then the cursor flashing, everything is normal, But roughly is about to enter the system, the computer suddenly "tick" a sound restart, restart several times is the case. Check the computer wiring, no problem. Start to select Safe Mode to enter the system, the operation is normal, after the reboot into the BIOS to see the CPU temperature, in the normal range, the elimination of overheating caused by the CPU reboot. It is normal to move before moving, consider whether the vibration is connector loose in the process of handling. Open the chassis, check the video card, found that there is no plugging, reseat the card firmly, restart the troubleshooting, and the Trouble


4, memory mismatch examples; 865PE, K7N2, k8n motherboards when using the 200MHz front-end bus, it is best to use cl=2.5 DDR400. Using Cl=3 's DDR400 often occurs automatically restarts the fault, at this time the memory drops to DDR333, the breakdown disappears. There are so many examples. We recommend that you use cl=2.5 DDR400


5, 0 line grounding example; There is a decoration design company 20 computers often automatically restart, and the more intense, finally reached the point of not working properly. Please take a look at the writer. Symptom: More than 20 computers on the 2 floor of a large studio, every three to two minutes automatically restart, sometimes all the computer at the same time restart, sometimes a sequence of restart, sometimes every 1 units/2 order restart, very rhythmic. Failure Analysis: The user reflects this phenomenon has been a week, the beginning is not serious, nearly two days serious, has been unable to work. At the same time there is no automatic restart on the 1 floor. The author analyses,


1, is unlikely to be the problem of the computer itself,


2, so rhythmic, must be outside interference, the biggest source of interference is the power cord, and then check the power line, check the distribution box, found that the 2-floor power supply line in the meter at the 0-line disconnect, to directly connect earth ground. On the 1 floor, the computer that does not restart automatically is the lighting line, and the 0 line is normal. At the same time to understand that a week ago a construction site started, with users in a grid line, construction site cranes and other electrical equipment generated by the interference signal through the ground string into the





Troubleshooting: Change to normal 0 line, troubleshooting.


Reference: Http://www.7e7e.net/htm/55.htm

==============================

Case: Computer inexplicably repeated reboot, motherboard capacitor damage caused by the fault

failure Phenomenon: A computer, its configuration is: Pⅲ866mhz (Dual CPU), ATi Rage Pro AGP 2x graphics card, MSI MS-6326 motherboard, 384MB SDRAM ECC memory, Seagate ST336705 LW SCSI 36GB hard disk, 15-inch color display, etc. , the operating system uses the Chinese windows2000/"target=" _blank >windows2000 Advanced Server Edition and installs the ISA2000 Server Enterprise Edition. As the unit of all computer rooms connected to the Internet Proxy Server, the work has been very normal. But not long ago, when I double-click the ISA Management icon to manage, the server suddenly inexplicably restart, reboot when the machine self-test all normal, and then began to guide the Windows2000/"target=" _blank ">windows2000, When the progress bar reaches two-thirds and restarts again, repeated problems cannot be solved.





Fault analysis and maintenance: The spirit of "first soft after the hard" principle, the author press F8 key into the safe mode, with the latest version of the 2004, no virus found. Open Control Panel → Double click system → open System properties → go to device management and look through all the devices without any conflicts. Reboot the computer and the symptom remains the same. decided to reload Windows2000/"target=" _blank ">windows2000, however, when entering the graphical installation interface, the progress bar reaches Two-thirds, the hard drive reads data quickly, and then restarts. Repeatedly reload the system many times, failure can not be ruled out, according to the author to determine the source of the fault should be in the hardware.





started thinking it was a SCSI hard drive out of the question, using the tools provided by the motherboard to detect the SCSI hard drive, the results did not detect any problems. Would it be a double CPU problem? A friend warned. Remove one of the CPUs, add electricity into the BIOS to adjust the relevant parameters of the CPU, restart the computer, when the Windows2000/"target=" _blank >windows2000 installed to the appearance of the graphical interface, the progress bar flashed, The next job went well.





　　To this end, the problem has not been completely resolved, in this is the CPU problem, or the motherboard on the CPU socket out of the problem? Shutdown, remove the confirmed CPU, plug into another CPU socket, power, start, the old problem again appeared, so the answer is very clear, is the motherboard CPU socket problem, carefully check the CPU socket near the components, found that there are two capacitor yellow and some drum kit, the problem is to judge the motherboard.　Contact the Customer Service Center, replace the motherboard, everything OK!