I have a Dell XPS 420 that originally came with Windows Vista in 2007. This pc has been upgraded in most ways. New hard drive, new memory modules, new power supply and running Windows 7 (32 bit). As a back up reference pc, it's used mostly for web based programs. Logitech wireless keyboard and mouse used. All peripherals' run thru the eight USB ports (keyboard, mouse, printers, etc). No problems in the last year until last week while booting up, an error screen stated "no keyboard found. Started out with simple checks like rebooting, installed fresh batteries in the keyboard and mouse, tried all 8 usb ports, even went to a wired keyboard. Even switched out the keyboards with a working pc. They worked fine. No PS2 ports to work with.
This is where I am now stumped.
I have two other working pc's that are Windows 7 64 bit and an older Windows XP units. I pulled the hard drive from the broke pc and attached it to one of my working pc to look at all the files. I'm not sure how to determine if it's hardware related, software related or motherboard related.
Any suggestions would be appreciated. Thank you