The computer starts buzzing.

, the computer in the Low-temperature environment often appear some problems. The most common is the computer power-on hum, is generally due to power supply, CPU fan bearing lubricating oil caused by solidification, a few minutes after the friction heat, lubricating oil also returned to the normal, "buzz" the sound immediately disappeared. In addition, when the ambient temperature is low, the hard disk disc may also be due to the increase in resistance and rotation, there is "hard to find" failure. The following is the author encountered three cases due to the low temperature caused by computer failure, together to see how to solve.





one, low temperature cause the motherboard does not work





fault phenomenon: unit Newly assembled a computer room, i810t motherboard, Tualatin Celeron 1.1GHz CPU, for several months to work very normal. Since entering the winter, the computer has failed, every morning when the computer, there are always several computer screen without display, open the chassis observation, found that power supply, CPU fan speed is normal, power LED is also lit. Plug in the fault diagnosis card test, LED light display 00, indicating that the motherboard is not running, the memory, power, CPU swap to other normal computer test no problem. Even more strange is that, if not shut down the host power, about 15 minutes later, the failure of the computer can return to normal, at this time cut off the power and then boot, can also start smoothly, into the Win98 system after all normal. Later, this phenomenon appeared on more and more computers, from several computers to more than 10 PCs.





Analysis and Processing: Unit room is located in the top floor, the roof has not been insulated treatment, although installed with air-conditioning, generally only on the machine time to open. In an accidental opportunity the author noted that, as long as the first air conditioner 15 minutes later to open the computer, all the fault of the computer can be successfully started, this just noticed that may be due to the temperature in the room is too low caused. In order to verify their inference, the failure of the computer to move to a central heating of the dormitory used, there is no such failure phenomenon. To further find the failure of the motherboard, find a hair dryer, heating block to the motherboard heating (note that the motherboard is too close), when heated to the motherboard CMOS chip, the motherboard successfully started. Due to the limited level of the author, it is impossible to further determine the faulty components. Estimated to be a resistor or capacitor due to ambient temperature is too low, the value of electrical parameters have changed, can not meet the motherboard to start the power requirements.





By looking for information, the computer to the ambient temperature has strict requirements, the state of the computer work environment has established a standard, that is, "computer site technical Conditions" (gb2887-89), of which the computer operating environment temperature requirements have three grades (see table), divided into a, B, C-Class. And in the morning the temperature of the room is less than 5 ℃, no wonder the computer can't run. After that, open the air-conditioner for 30 minutes, then turn on the computer power, the computer will never be able to start the phenomenon. 3lian.com





two, low temperature cause the computer can not find hard disk





fault phenomenon: Friends in the last summer to upgrade the computer, the motherboard for the promotion of technology IS7, P4 2.4GHz CPU, Yu-Zhan 256MB memory, due to limited funds did not buy a new hard drive, using the brand machine removed from the Seagate U5 20GB hard disk, use has been very normal. In the winter, friends reflect just boot up occasionally can not find the hard drive, a reboot will be able to find, the recent situation is getting worse, probably to reboot several times to find the hard drive.





analysis and processing: rushed to a friend's home, power-on check, after the memory self-test began to detect IDE devices, can only find the Samsung 52X Optical Drive, unable to find the hard drive, the preliminary determination of data cable or hard disk problems. Take apart the chassis, the optical drive to the hard disk on the 80pin data line, again, the system can only detect the optical drive and detect the hard drive, it seems that the hard drive data cable is no problem, bring their own Seagate 7200.7 80GB hard disk to the computer, the machine successfully identified a new hard drive, But this 20GB hard drive to the author's computer is also very normal, and there is no motherboard can not find the hard disk, the hard drive to pick up the computer friends, the problem remains.





At a friend's home many times the test, put the ear close to the hard disk and observe the monitor, feel always in the motherboard after the IDE device after the hard drive to appear high-speed rotation of the sound, presumably because the hard drive has not yet entered the normal working state, the motherboard has completed the IDE device detection, of course, Comparing friends and the author's computer work environment found that friends live in a high-rise building behind the cottage, the winter is only heating the heater, the room temperature is very low, and the author's home is in the central heating district, room temperature is very high. According to the structure analysis of the hard disk, the motor drives the hard disk disc to rotate at high speed, and reads the disc data by swinging the head arm. In the low temperature environment, the hard drive part of the lubricant is likely to be in a semisolid state, the hard drive from the power to start running to fully into the normal state of the time than the high-temperature environment to longer, and now the motherboard supports the fast self-test function, in the hard drive has not yet entered the normal working condition has completed the IDE device detection, Of course I can't find the hard drive.





boot into the motherboard BIOS, check the relevant options with the motherboard instructions, in the "Advanced BIOS Features", there is a "Delay ide Initial", which is to delay the initialization of IDE device waiting time, can set a range of 0-15 seconds, The default is 0. Set the value to 15 seconds, save exit to restart the computer, the motherboard did not wait 15 seconds before detecting the IDE device, or the hard drive was not found. Is there a bug in the motherboard BIOS? The author of Seagate 80GB Hard drive, the fastest speed to install the system, in the Http://www.mydrivers.com/dir74/d29987.htm page found the latest 1.5 version of the IS7 bios, download After the refresh, replace 20GB hard drive, again The "Delay IDE Initial" value is set to 15 seconds, reboots, detects memory system pauses, detects IDE devices after 15 seconds, and successfully identifies the Seagate U5 20GB hard drive. After a few days of observation, no longer found the hard drive situation.





third, low temperature led to Flat panel display without display





fault phenomenon: Due to the work needs, the unit to the author equipped with a CMV-1515 LCD display, a few months to work is very normal, last year into the winter, the liquid crystal display has appeared problems. On the power-on, the screen appears similar to clutter interference grating flicker phenomenon, but also can hear similar relay "clicks clicks" Sound.





Analysis and processing: At this time the host's hard drive light is still flashing, a moment from the speaker into the desktop sound, it seems that the system is still running. Swap with a common CRT display, the image shows normal, and then the LCD switch to the next host, The fault is still, it seems to be the problem of liquid crystal display.





car to the computer city replacement, the distributor where the LCD display is normal. After consultation, the liquid crystal display needs suitable working environment, in the manual also indicates the normal working environment temperature is 5℃~35℃, the humidity is 20%~80%. The unit office in the morning the minimum temperature of 5 ℃, back to the unit to open air-conditioning, when the ambient temperature reached 20 ℃, and then turn on the LCD display, the screen appears normal, it seems that the LCD display is not the reason for the temperature is too low.





generally we only notice in the summer to cool the computer, to prevent the high temperature caused by hardware failure, did not expect the winter computer also need to "warm", or low temperature will also make computer strike. It seems that computers and people also need a "winter warm summer cool" work environment.