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2 Dead usb ports. low speed on others on HTPC
I'm running a compaq HTPC with M2N68-la motherboard. OS on SSD working ok. 2 of 6 usb 2.0 ports are dead the others act like 1.1. for 2 different external HD's I'm getting message "this device can perform faster on 2.0" (tray balloon.) No errors in device manager. it shows standard enhanced PCI to USB host control (2.0) I have uninstalled and updated drivers in all usb listings to no avail. I have installed chipset drivers Drivers | GeForce . No change. I tried system restore and ran sfc /scannow(no corrupted files found)
What else should I try?
Any advice will be appreciated.