Win7 Ultimate system can not complete the five common reasons for self-testing

        
Reason one, bios self-test maintenance
After the computer system completes the self-test of the graphics card, it will generally check from the beginning bios code.
Reason 2, cpu l2 or l1 cache is not completely damaged or cpu other circuits appear aging phenomenon
When our host completes the initialization of the graphics card, the next step is to detect cpu self-test. When the c1's l1 or l2 fails, it will be stuck for a long time at “check nvram......”. When this fault occurs, some machines can also enter the cmos setting. We can manually close the l1 and l2 of the cpu and try to observe whether the machine can pass the self-test. If you can, then the cpu can basically slow down. If not, you can only replace the cpu to solve this problem.
When cpu appears partially damaged, it often shows that the system reports bios error (class is destroyed by chir virus), l1 or l2 error, can't pass self-test, can only enter safe mode, automatically restart during startup. .




























When the graphics card's bios is damaged or the agp communication circuit is faulty The inspection can not pass and cause a crash.
Generally used two or three years of motherboard, because the machine works for a long time, the filter capacitor around the cpu is lost due to baking, resulting in an increase in the AC component of the cpu power supply. Occasionally, the boot can be normally booted into the desktop, often crashing during the self-test, and the fault performance is very unstable and changes.
Reason four, memory module repair failure
When the computer win7 system completes cpu detection, it will perform the memory test phase. If we turn off the post quick detection option, we won't see a long time in the memory test world when we turn it on. After a few times, we can only test it once.
When the memory chip is faulty or the memory slot is deformed and the memory is in poor contact, the memory stick gold finger is oxidized, the memory slot metal reed is deformed or broken, and the memory supply voltage is low or high, the memory self-test cannot pass. And crash.
Reason 5, bios chip failure or bios virus damage
General host power supply after the initial completion of the bios code program, first win7 system will read the first instruction in bios into memory and explain Execution, the instruction is the same whether it is award or ami, is a 3-byte jump instruction, and then reads the bios bootstrap block to complete the detection and loading of the bios itself. Only after the computer system reads the bios code into the memory, the CPU will start self-test and start according to the code program.
If there are not many faults in bios, occasionally the bios chip will fail due to aging, and the memory of some memory units will be incomplete, resulting in the failure to complete the system function call and the normal startup. A virus such as cih maliciously rewrites the bios code of the motherboard, causing the host to fail to boot. After booting, the host can normally power up, the fan works, but the self-test process cannot be completed. At the same time, the display has text display, and the host has an alarm sound; Seriously, it may only be powered, the display has no image, and the host has no alarm.