USB not working on Asus P4P800 SE

[JesseKnows]

I have a very weird situation:
I have a system built around a P4P800 SE motherboard. I had installed Windows 7, and found that although the USB controllers are in the Device Manager, plugging in a USB stick into any of the USB connections (rear or front) is not registering. With one old 64MB stick that has a LED, the LED blinks (rather than light solid). I had given up for a while.
Today I transplanted a Windows XP installation into that system. It was close enough in hardware so it completed boot and discovered everything. However, the USB drives still do not register!
To work around that I put in a USB PCI card and its ports also do not work!
I thought maybe the 5V on the poser supply were at fault, but changing the motherboard jumpers to use 5VSB for USB did not help either.

I will try a different power supply next time I break that case open. Any other advice?

J

 

[JesseKnows]

I am now using a different power supply and USB still does not work. An LED USB mouse lights up but does not work.
I tried changing BIOS options for USB (High speed/ full speed; not all 8 ports active) and no change.

Ideas?

 

[Computers_Plus]

Sounds like the USB controller on the board is bad

 

[kiriakos]

Insert the USB stick , and reboot with it , get in to BIOS , at the USB section.
If the USB stick is detected , you will see some extra options in the BIOS so to become part of the boot.

 

[JesseKnows]

Sounds like the USB controller on the board is bad

That's what I thought, but then why would a separate PCI USB controller not work?

One combination I did not try was to disable all motherboard USB and then try an add-on card. Perhaps the non-functional motherboard USB is interfering with the add-on's drivers?

 

[kiriakos]

There is no drivers issue with any add on card , simple because it uses its own IC's and system resources .