USB keyboard and mouse not working after upgrade

By trinityoaks
Jun 16, 2014
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  1. Replaced the mobo (Gigabyte GA-78LMT-USB3), CPU (AMD FX-4300 Vishera), and RAM (G-Skill RipJaws 4MBx2) in an older system running WinXP (planning to upgrade to Win7 ASAP). Everything booted up just fine, but the HP keyboard and the Logitech mouse, both of which which work fine on another computer, aren't being recognized at all by the computer. No error messages, just not working. Not even lighting up. We've tried every USB port on the system, and even used a USB-PS/2 adapter to try it that way, to no avail. I'm out of things to try. My only thoughts:

    1. Could USB be disabled in BIOS by default? If so, how do I change that without a keyboard and mouse, when I can't even access the BIOS?

    2, Could the USB system on the new motherboard be defective? How do I test that?

    3. Is there any possibility at all that it's related to the Antec 500W PSU--perhaps not enough wattage for this system? (Hard drives are all pretty old.)
  2. LookinAround

    LookinAround TechSpot Chancellor Posts: 8,361   +167

    Create and boot from a Knoppix Live CD (just google to find and download the ISO). If USB still doesn't work when you boot from knoppix, you know it must be either hardware or BIOS issue.
  3. misor

    misor TechSpot Addict Posts: 988   +147

    Since the keyboard and mouse works great at another computer's usb ports, then there is something wrong with your current setup. (bad usb ports?)
    if you have a generic keyboard and mouse, you can try these too.

    also, you can try to clear CMOS (reset BIOS). after 5 minutes or so, with motherboard battery in place, try to boot again.
    Last edited: Jun 17, 2014


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