POST TEST (Power On Self Test)
Each time the computer boots up the computer must past the POST. (Power On Self
Test) Below is the common procedure of the POST:
1. The first step of POST is the testing of the Power Supply to ensure that it
is turned on and that it releases its reset signal.
2. CPU must exit the reset status mode and thereafter be able to execute
BIOS must be readable.
4. BIOS checksum must be valid, meaning that it must be readable.
CMOS be accessible for reading.
6. CMOS checksum must be valid, meaning that it must be readable.
7. CPU must be able to read all forms of memory such as the memory controller,
memory bus, and memory module.
8. The first 64KB of memory must be operational and have the capability to be
read and written to and from, and capable of containing the POST code.
9. I/O bus / controller must be accessible.
10. I/O bus must be able to write / read from the video subsystem and be able to
read all video RAM..
If the computer does not pass any of the above tests, your computer will receive
an irregular POST. An irregular POST is a beep code which is different from the
standard, which can be either no beeps at all or a combination of different
beeps indicating what is causing the computer not to pass the POST.
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