I've been out of town for two weeks. Supposedly noone touched my pc at all. I came back and when i went to boot my PC, the HDMI wouldn't actually transmit input. I tried tightening cables, using a different HDMI cable... Nothing works. Also, just in case this helps, my mouse that's meant to light up right when the pc starts (been like that since i bought it) won't light up. Ever. Any help?