Where can I find the POST string?

In general, the POST string is located in the bottom left side of the boot screen (for BIOSes which provide it). Depending on the BIOS vendor, the POST string may provide various info about the board (like chipset or date). Here is a list of common vendors and their string meanings:

You can find a list of BIOS chipset and manufacturer IDs here

1. Award BIOS

awardbios awardbiosinfo

2. AMI BIOS

amibios amibiosinfo

3. Acer BIOS

acerbios amibiosinfo