开机不自检原因（Boot no self check reason）.doc

开机不自检原因（Boot no self check reason） The screen has an image display, but the self-test process cannot be completed 1, BIOS chip fault or BIOS is destroyed by virus When the host is powered on, the BIOS code program is initially added. First, the system reads the first instruction in the BIOS into memory and explains the execution. The instruction, whether AWARD or AMI, is the same for 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, CPU will execute the self-test and startup process in accordance with the code program. BIOS does not have many failures. Occasionally, the BIOS chips fail because of aging and some storage units fail, so that the program code is incomplete, and the function calls of the system can not be completed properly. Also, like the CIH virus, rewrite the motherboard BIOS malicious code, cause the host can not boot, boot the host to normal power, fan, but was unable to complete the process of self display at the same time, the text display, the host and the alarm sound; of course, may be the only serious power, no image display, but also the host no alarm. 2, graphics card failure Graphics card BIOS damage or AGP communication circuit failure, will appear when the video card initialization can not be completed, leading to the host in the boot, the screen stays at the video card for a long time, BIOS self-test can not pass through the crash. Note: the use of two or three years of board, especially for use in Internet cafes in the machine, because the machine long time high temperature filter capacitor CPU around by baking and loss, caused by the AC component CPU power supply increase in performance for the machine in the start is not easy, requires multiple boot occasionally to boot into the desktop, often the crash in the process of self, the fault is unstable and changeable. 3, BIOS self-test After the system