|See Response 3.|
Are those voltages within 10% ??
The USB Host Controllers are not necessarily the only USB controller related devices that use an IRQ.
E.g. if the mboard has (a) USB 2.0 controller(s), and if the mboard main chipset drivers have been loaded, and if Windows has had SP1 or later updates loaded, there is also an Enhanced or similar Host controller listed that supports USB 2.0 - that uses a different IRQ - that IRQ should not be shared with anything that isn't built into the mboard either.
If your mboard DOES support USB 2.0, and if you're NOT seeing an Enhanced or similar controller listed, then either or both of..
- you haven't loaded the main chipsets drivers for the mboard
- Windows does not have SP! or later updates loaded.
You could try re-loading the USB stack as I outlined at the link pointed to in Response 1.
Some mboards had electrolytic capacitors installed on them that were not properly made. They eventually fail, and when they do, you can have all sorts of weird symptoms.
Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .
This was the original bad capacitor problem - has some example pictures.
History of why the exploding capacitors and which mboard makers were affected:
What to look for, mboard symptoms, example pictures:
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.
Pictures of blown capacitors, other components, power supplies, Athlon cpu's, etc.: