I restarted my computer tonight and all USB devices won't work. The USB keyboard works fine in the BIOS, and the both the mouse and keyboard light up when the computer boots. But the moment the Windows 10 boot screen comes up (the one with Windows Rollback or Technical Preview), they both go dark. The USB hard drive, WiFi USB device, webcam don't work and when I plug/unplug them, no prompts in Windows come up. This may be a power consumption issue, but I haven't been able to test another OS. Nor have I ever seen anything like this happen before.