I have a core 2 duo in a gigabyte mobo socket 775. I bought a new core 2 quad Q9300 and installed it but when I boot up it only goes to the mobo splash screen. I also dont have any keyboard functions. All the usb ports will only get power for a second when you plug them in. If I put the older cpu back in everything works great. I think it might be a bad cpu which sucks since it is brand new and I can't return it.
Mobo gigabyte EP43-UD3L Rev 1.2
Mobo gigabyte EP43-UD3L Rev 1.2