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Dell XPS 400 no power to usb or pci slots

Need help. My Dell usb ports do not read the keyboard. I receive a keyboard error on boot because there's no power to the USB ports. Keyboards good. Tried plugging in a usb card to the PCI slot and it still won't read. Also, tried plugging in a usb drive, same thing no power. But wierd thing is the AGP card works fine and it boots up fine but it can't read the keyboard.

Any idea's.

Thanks for any help.

MKeith

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  • ron_va Nov 27, 2008

    Same problem--and of course the warranty expired 4 mos ago. Dell support is pitiful. Lost all USB capability. Can't enter BIOS or Boot options because there's no human interface at this point. I'm leaning toward trying a new PSU, but the fans are all working, the MOBO has a green light, and the power button is green. I also have the diagnostic codes 1 2 3 lit up just above it. Currently working from the 8 yr old Presario P3 which has NEVER had a problem.

  • Kristoffer Martin Oct 16, 2013

    It's probably a bios lockout problem. The bios has been set to basic controls only which means you'll need a PS/2 keyboard to get into it. What I'd suggest you do, as this computer doesn't have a PS/2 port, you need to flash the bios. Unplug the computer from everything. Open the case so you can see the motherboard and locate the cmos battery which happens to be a watch battery. Remove it gently and don't break the bracket. Leave it out for a day and then place it back in and restart the computer. If that didn't do it, you probably have a bad board and it's not distributing power correctly through the PCI ports and the built in USB ports.

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I have had the same problem with my dell xps 400. What I did was purchased a usb power hub and that solved the problem for me. SAved me from buying a new mother board.

Posted on Dec 10, 2008

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Follow-up from ron_va: I tried the suggestions above. Couldn't get to the bios since the keyboard input was gone. I even tried disconnectojng the hdd, and forcing to a bootable cd. Tried a known good PSU and pwr'd USB hub, but no luck. All indications were the mobo USB controller went bad. I ended up ordering a replacement mobo from dell ($159) and all is well, for now. After spending $800+ on a new XPS back in Aug 06, I wasn't ready to trash the system just yet.

Posted on Dec 10, 2008

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Hai

reset your BIOS settting to fail safe default and try it works

Posted on Sep 10, 2008

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http://support.dell.com/support/edocs/systems/studio8100/en/sm/index.htm

I would like you to click on - Technical Overview

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C) USB:

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=5079829&CatId=2688

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Information on PCI, and PCI-Express;

PCI:
http://en.wikipedia.org/wiki/PCI_local_bus

PCI-Express:
http://en.wikipedia.org/wiki/PCI_Express

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