What to do if the motherboard does not have power self-test

What to do if the motherboard does not have power self-test

The following may be the case:

1, video card failure

If the bios of the video card is damaged or the AGP communication circuit fails, the video card initialization cannot be completed, causing the host to stay on the screen for a long time when the video card is not available.

Note: Use the two or three-year motherboard, especially in the Internet café used in the machine, because the machine for a long time high temperature work, the CPU around the filter capacitor due to baking and loss of capacity, resulting in the CPU power supply in the exchange of components, performance for the machine in the start-up is not easy, need to boot Often in the self-test process freezes, failure performance unstable and changeable.

2. BIOS chip failure or BIOS damaged by virus

After the main engine power to complete the BIOS Code program, first of all, the system will read the first instruction in the BIOS into memory and explain the execution. The directive is the same for both award and Ami, and is a 3-byte jump instruction. The next step is to read the BIOS bootstrap block to complete the detection and loading of the BIOS itself. Only when the system reads the BIOS code into memory does the CPU start the self-test and startup process according to the code program.

The failure of the BIOS is not much, occasionally the BIOS chip due to aging and some of the memory unit failure, resulting in incomplete program code, can not complete the normal system function calls and the phenomenon can not start normally. And a virus like CIH, malicious rewriting of the motherboard BIOS code, causing the host can not start, after the boot host can be normal power, fan work, but can not complete the self-test process, while the display has text display, host and alarm sound; Of course, the serious may be only power, the monitor does not have the image, The host also does not have an alarm sound.

3. BIOS Self Test

After the system completes the video card self-test, the BIOS code check is started, and the BIOS version number and the motherboard model are usually displayed on the monitor.

4, the CPU L2 or L1cache not completely damaged or CPU other circuit aging when the host completes the graphics card initialization, the next start to detect CPU self-test. When the CPU's L1 or L2 fails, it will stagnate for a long time in the "CHECK NVRAM ..." section. When this fault occurs, some of the machines can also enter the CMOS settings, we can manually shut down the CPU L1 and L2, and then try to see if the machine can pass the self-test. If you can, the CPU is basically able to spin down and use it. If not, you can only replace the CPU to resolve the problem.

5, Memory failure

After the system completes the CPU detection, it carries out the memory test phase. If we turn off the post quick detection option, we will not see a long memory test interface (three times in a row) on the power-on, only one Test at a time. Memory chip failure or memory slot deformation and bad memory contact, memory gold finger oxidation, memory slot metal reed deformation or rupture, memory power supply voltage low or high will appear memory self-test can not pass and panic.

Common fault Analysis for additional CPUs:

Poor CPU pin contact causes the computer to not start

Example 1: A colleague with a speed Dragon II CPU computer work Normally, one day suddenly unable to boot: The screen does not signal that the keypad light does not light. Speculation is the problem with the video card and the monitor, and the replacement check is normal. Later unplug the CPU inserted in the motherboard, found that the above pins are black, hair green, there are traces of oxidation. Use a toothbrush to clean the CPU pins, the computer can work after power.

An average of 10 minutes to restart the computer

Example 2: A dormitory roommate playing games, did not play one hours computer restart, at first he did not notice, restart after playing. Then in the process of playing a number of restart, time is not fixed sometimes 10 minutes sometimes half a clock. Then turned to me for help, just started to think that the heat is not good, open the chassis to view. As a result, there is a lot of dust inside the chassis, especially the fans. Then all the accessories are removed, swept and reassembled with the brush, which solves the problem.

The CPU occupancy rate always reaches 100%.

Example 3: When we use the XP system, we slow down with the system and open Task Manager to find that CPU occupancy is up to 100%. High CPU usage possibilities are: "1" antivirus optimization software caused by the fault, anti-virus software contains a lot of small application plug-ins, as far as possible to avoid the installation of the application of "2" installed without the certification of the driver caused by the resource occupancy "3" virus Trojan caused a large number of worms within the system quickly replicated, resulting in waste of resources Usually the solution: (1) into the "Control Panel", "Administrative Tools", "Services", select "Rising Real Time Monitorservice" Click the right mouse button, change to Manual. (2) Click "Start-run-enter msconfig--start", close unnecessary startup items, and then reboot.

CPU frequency drops automatically

Example 4: The normal use of the computer after the start of the original 3.1GHz frequency has become 3.0GHz, and display a "Defalts CMOS setup Loaded" information, in the new CMOS Steup set CPU parameters, the system normally shows 315 frequency, But after a period of time again appeared the above fault. The assumption is that because of the lack of power to the CMOS battery can not save the settings parameters, so change the battery to solve the problem.

How to deal with high CPU temperature

Example 5: A computer in the initial performance of the use of unusually stable, but later appeared to infect the virus, performance dropped significantly, occasionally accompanied by the crash. But repeatedly check the thermal grease and heat sink is no problem, reinstall back or repeated heavy addiction. After replacing the cooling fan, everything is OK. After repeated comparisons finally found that the buckle is the direction of the reverse. As a result, the heatsink and the core of the CPU contact with the gap, resulting in overheating the CPU, at this time, the heatsink can be reinstalled.