I have an asus M4A785-M mobo that i received with a computer kit. The case that came with the kit has 2 front panel usb ports The 6 rear mobo usb ports works fine , and I connected the 2 front panel usb ports on the case to the mobo (with the supplied cable) to the usb 2 connectors on the mobo. As soon as I connect a usb device to the front panel usb ports, the mobo resets and displays the bios spalsh screen. I updated the bios to version 1006 , tried a different usb connector on mobo, and set the plug and play to use OS for plugnplay not required at boot. I was able to use the ports without incident, but the problem now creeps up once in awhile. There are no usb controller updates on the asus website that I see. I tried checking the ports with a flashlight for debris, but appears all clear.
I thought maybe changing the usb speed or disabling legacy support. Any further suggestions?