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USB ports I have 7215 HP slimline media player desktop computer. My USB ports and I have 5 in the back and one in the front do not work. they  were working before I had my printer hooked up and my kids were using it to download music to there ZUNE player. It just stop working and I think the drivers need to updated? My computer is only 1 year old, do I have replace the USB card, but the one that is front of computer does not work either. I reinstalled the the drivers using the device manager, but nothing. I go to HP site, and there I guess I am asking what is the procedure. My media card players in the front I have 3 do not work either, is there something turned off that I do not know about? I have looked everywhere from my BIOS to working with the device manager but nothing works, I am hoping somebody is had the same problem, thanks.

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  • richardl Nov 09, 2007

    When I plug in the printer or my digital camera I get the mesasge(device unknow)(USB not regonized). It shows in the device manager (device unknown). If my USB ports were fried it would not even recognize it right.

  • richardl Nov 09, 2007

    First time doing this, I did not know about the ratings; sorry if I hurt your ratings nothing personal.

  • Sanbaker Dec 05, 2007

    Win 2kSP4
    Won't recognize Flash or USB HDD drives of any size indicates "Unknown device" in front or rear USB inputs. Tried reinstalling drivers --no good same problem, BUT sees the printer!!

  • peter1978 Mar 15, 2009

    Hi! I`ve got desktop - HP5100 small form factor PC.
    I use USB for external HDD, webcam, iPod and wireless network adapter...
    Problem is, that I can`t use at the same time wireless adapter and webcam or Ipod.. Or having plugged iPod and HDD together..
    Example: wireless and HDD are working right.. After plug in iPod, the system shows, that USB doesn`t recognize other devices, only iPod does work.. And after I plug in webcam, wireless dowsn`work, so I can`t use webcam on net..
    I think,there could be problem with USB voltage.

    Do you have any solution for me,what can I do, pleeaaaaaaseeeee
    Thank`s with hope.. Peter



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Did you try deleting or uninstalling all the USB device drivers, then reinstalling them? They should be auto-detected after you remove them. If not, reboot and then they will.

Posted on Nov 08, 2007

  • Peter Burns Nov 09, 2007

    If you're going to rate me "not helpful" then I won't give you anymore advice. These negatively affect our ratings.

    Good luck getting anymore help on here.


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If usb devices will not work and windows just says can not find software after it trys to load it, then maybe your windows/inf/infcache.1 file is corrupt. delete it and all is well. when this happened to me, some usb devices still worked and some not.

Posted on Dec 28, 2009


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