so turn it on and the fans start up but it wont load the bios ive changed the battery but nothing changed is there any diagnostic software which i can install on one computer and scan the other via sata port or usb price is not a problem

I need diagnostic software and / or hardware to trouble shoot computer hardware and software issues on PCs. I'm looking for any suggestions for what package to get,
I am currently using Window XP, and trouble shoot problems for my family that use a variety of Windows O/Ses

I am interested in getting started in computer repair. I have seen many computer diagnostic boards that you plug into a PCI slot. They will tell you if the motherboard, power supply, memory, processor, etc. are dead or dying. Anyone have any experience with these? I DO NOT want diagnostic software, I want information about a diagnostic CARD. Are these worth the money? Do they work? Can someone recommend a decent one? Thanks for your help!