swmelon Posted August 20, 2006 Posted August 20, 2006 Some of the USB ports stopped working maybe a month ago. Now all the USB ports are not working on my computer. Looks to be it's the MB's problem. I tried pretty much everyting I could do. I reinsalled USB drivers in hardware manager, newly installed windows xp/ windows 98 SE, reset my BIOS, and installed USB-to-PCI card, but still not working. In device manager it says "unkwon device" for any usb devices. In addition, there are two USB Root Hub and two OpenHCD USB host controller installed without any problem in the device manager. I also measured the VCC voltage using multimeter. It was 5V which is normal. Does anyone have any idea how to fix this without having the MB replaced? Thanks. My specs are: Sempron 3100+ Paris (OC'ed to 2.4 Ghz when the problem occured) DFI Lanparty UT nf3 250gb 400W Antec PSU Windows XP SP2 Quote Share this post Link to post Share on other sites More sharing options...
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