1. If the BIOS chip fails or the BIOS is damaged by virus, the BIOS code program should be initially added after the host is powered on. First, the system reads the first instruction in the BIOS into memory and explains its execution. This instruction is the same for both AWARD and AMI, and it is a 3-byte jump instruction. The next step is to read the BIOS boot block to complete the detection and loading of the BIOS itself. After the system reads the BIOS code into the memory, the CPU will start the self-check and startup process according to the code program.
2. When the graphics card fails, the graphics card BIOS is damaged or the AGP communication circuit fails, the initialization of the graphics card cannot be completed, resulting in the host staying in the graphics card BIOS self-check for a long time.