Whenever I plug in any USB device, the monitor will go blank, but the case fans and lights will continue operating. The computer remains like this until I hold down the power button to turn it off and then restart it. It will restart fine. In addition to the monitor going blank, all power is turned off from USB devices (e.g. optical mouse light turns off).
This occurs probably about 25% of the time I plug a USB device in (sometimes nothing happens, as should be).
It does not mater which port I use. It's happened with rear ports, a hub wired to a rear port, front case ports (plugged into motherboard USB pins), or a PCI USB hub.
I've looked extensively for solutions and can't find any. I checked my motherboard multiple times for swollen capacitors and have not found any.
Today (and never before) when I plugged a mouse in, the same issue occurred, but the monitor turned back on about two seconds later, and a pop-up notified me of drivers successfully being installed. (I didn't notice whether USB power was cut) This makes me think that the computer is adjusting the display (as it does when a program requests administrative permission and the screen sometimes goes blank) but for some reason does not come back from it. There really is no indication that Windows stops. I never get a BSOD.
Operating System: Windows 7 64-bit, regularly updated
Display Adapter: Nvidia GeForce 9600 GSO (756MB)
Let me know if you have any ideas. Thanks a lot.