Help: USB Devices sometimes not powering up.

[SpeedyVV]

My system runs fine most of the time, but sometimes USB devices are acting up.

When I power up my system, one or more USB devices do not seem to be getting power.

I have the following USB devices:
- MS Keyboard
- MS Mouse
- Dell 3007WFP-HC USB connected (Media cards and 2 USB Ports)
- Logitech G25 Racing Wheel
- M-Audio Black Box (USB 1.1)

I have others, but they are usually not connected (external HDD and Logitech Gamepad)

When they work, I get no errors at all in Device Manager. Actually I get no erros even when they dont work. They just are not powered up.

Sometimes it is the mouse that gets no power, sometimes keyboard, sometimes the G25,
sometimes mouse and keyboard, no real pattern that I can tell.

Sometimes i just power down, turn off the PSU and all goes back to normal.

Sometimes, if I just wait long enough, the keyboard or mouse just wakes up.

I even went and bought a 4 port powered usb hub to see if it would help. Still the same.

I removed the usb bracket for additional 4 usb ports that connects to came with the evga 680i, no diff.

Any advice is appreciated.

I did a search, and did not find anybody else with these symptoms.

Help.

 

[RoBo]

I would guess you are overloading the USB bus.

 

[SpeedyVV]

I would guess you are overloading the USB bus.

On what? Power, bandwidth? Any way to diagnose this?