>Q1: Which memory exactly does the BIOS check? RAM or ROM?
>RAM --> Empty during the booting.
Not if it is a warm boot. Yes, if it is a cold boot--power removed.
>Q2: When the BIOS loaded into the RAM? between which steps?
It depends on the BIOS. Believe Award does it just before it checks the keyboard controller. It may not shadow the BIOS. Most motherboard now use FLASH memory, which is much faster than a ROM, and shadowing the BIOS is not usually enabled by default. There are many books and Internet references to the post/boot process. Larry