What to do if the motherboard is not on self test

Why the motherboard does not self test and how to solve it:

1. 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.

2, 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.

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.

Solution for additional motherboard not displaying:

The first thing we need to check is the BIOS. Important hardware data is stored in the BIOS of the motherboard. At the same time the BIOS is also a more vulnerable part of the motherboard, very vulnerable to damage, once the damage will cause the system can not run, such a failure is generally due to the motherboard BIOS is CIH virus damage caused (of course, also do not rule out the motherboard itself failure caused the system can not run. )。

The general BIOS is damaged by the virus after the hard disk data will be lost, so we can detect the hard disk data is intact to determine whether the BIOS is damaged, if the hard disk data intact, then there are three reasons for the boot does not show the phenomenon:

1. There is a problem with the motherboard expansion slot or expansion card, which causes the motherboard to not respond without a display after inserting an expansion card such as a sound card. )

2. Jumper board in the CMOS set CPU frequency is not correct, it may also cause the failure to display, as long as the elimination of CMOS can be resolved. Clear the CMOS jumper is typically near the lithium battery on the motherboard, its default position is generally 1, 2 short circuit, as long as it is changed to 2, 3 short-circuit a few seconds to solve the problem, for the old motherboard if the user can not find the jumper, as long as the battery off, to boot display into the CMOS settings after the shutdown, The battery is also up to the purpose of the CMOS discharge.

3. The motherboard does not recognize memory, memory corruption or memory mismatch can also lead to the failure of the boot display. Some old motherboards are more critical of memory, and once plugged into the motherboard can not recognize the memory, the motherboard will not be able to start, and even some motherboards do not give you any fault prompts (tweet). Of course, sometimes in order to expand the memory to improve the performance of the system, the result of inserting different brands, types of memory will also lead to the emergence of such failures, so in the overhaul, should pay more attention to.

For motherboard BIOS damaged failure, we can plug in the ISA video card to see if there is no display (if prompted, you can follow the prompts step.) If there is no boot screen, you can make an automatic update of the BIOS floppy disk, re-refresh the BIOS, but some motherboard bios is damaged, the floppy drive does not work at this point, you can try to use hot Plug method to resolve (I have tried, as long as the BIOS is the same, in the same level of the motherboard can be successfully burned. )。

However, the use of hot-plug extraction requires the same BIOS may also cause some components of the motherboard damage, so the reliable method is to use the write code to the BIOS update file into the BIOS (you can find this service for the computer to solve the more secure).