WIERD USB Issue

[StarsFan4Life]

I am having the STRANGEST problem with my front USB ports on my coolermaster case. These are plugged into a port on my motherboard for USB support. However, when plugged in to the motherboard, and the computer is on, I try to connect a USB device (flash drive, webcam, printer, etc) and it causes my computer to go black...it stays on, but everything goes black and the only way to fix it is to turn the PC off and back on.

If I have the devices plugged in before turning on the PC, it works just fine. It just is a problem if the devices are NOT plugged in prior to turning on the machine. Sounds like a grounding issue, but I thought I would see if you guys knew.

My config:

* Cooler Master Elite 330
* Gigabyte GA-MA78GM-S2H 780G motherboard
* AMD Phenom II Quad 940 Black Editon - Stock cooling
* 8GB G-Skill PC2-6400
* XFX Radeon 4870 1GB
* Western Digital Caviar Black 1TB SATA II
* Western Digital Caviar Black 640gb SATA II
* Onboard LAN/HD Audio
* Antec Earthwatts 650wt psu
* Logitech DiNovo Keyboard
* Logitech MX Revolution Mouse
* 2 X Yate Loon 120mm silent case fans
* 2 X Dell 23" S2309 W @ 1900 x 1080
* Microsoft Windows 7 64-bit and all updates

 

[nobody_here]

maybe an IRQ issue between one of the USB host controllers and the video card PCI-E host controller?

 

[StarsFan4Life]

maybe an IRQ issue between one of the USB host controllers and the video card PCI-E host controller?

How can I fix this?