About POST Diagnostic Card, I bought mine thru credit card on the internet. But I've seen China-made versions at FASTWIN.
About ESR Meter schematic, I designed/built my own circuit kay mahal kaayo sa gawas ang ready-made unit. Wala pod ko kakita ug baligya ana diri.
About BIOS matters, visit
www.wimbios.com. It's the number 1 international forum on BIOS reprogramming & repair. Plenty of BIOS gurus there who are willing to teach you and help. Yours truly is a senior member in that forum.
About hardware troubleshooting & repair, visit
www.experts-exchange.com. You will learn a lot from there.