Missing USB Controller in Device Manager

[pastordan]

I recently moved my computer and when I plugged everything back in, it did not recognize my USB ports (one had a software key and the other is plugged in to a vinyl sign cutter).
When i checked the device manager, the usb controller was missing.
Is there any way to 're-enable' this?
I have Windows XP home edition.

Thanks for any help.

Dan

[bbeard67]

Have you tried "control panel" "add new hardware"

[bbeard67]

Try checking your bios
During bootup usually pressing DEL key will bring you into the bios
and Enable USB controller

Moving your computer may have disconnected this very small and light connector but try your bios first to be sure USB is enabled

[luckydip]

I had exactly the same problem , when I reinstalled Windows XP(SP2) on my friend's computer:
USB Controllers were not listed in Device Manager.
It was MDG system with Intel's integrated motherboard.
I think integrated motherboard caused the problem.
I was reinstalling Windows from desk top maker's CD.
They recommend to install chipset driver and BIOS update first thing after complete reinstall,
but that did not resolve the issue.
I spent almost 2 days trying to find solution. I searched Google and tried everything I found on differnet forums and Microsoft website, installing .NET Framework and other available updates. Nothing worked.
I knew I had to re-enable USB in BIOS.
But when in BIOS, I could not modify entry for USB, it did not allow me to do that.
I was not allowed to select USB on Advanced tab.
SO I just selected Set Defaults (F9), and immediately I could see that USB was enabled. I saved and restarted the computer...
The problem was resolved. After restart, the system found USB controllers and installed them.
PS : Microsoft claims the problem can be resolved by installing Windows updates, but it never did.
I noticed this problem is quite "popular". I personally went through 20 or more sites.
PS: another workaround: to buy separate USB (2 or 4 ports) card, if 1st solution does not help.
Good luck! I know what you feel!

[cyou]

or you could try disconnect the usb cables and put them back in one at a time while the machine is on try different ports till you get some where if that doesn't work try reinstalling your drivers from your instillation CD if you have one