i was installing windows 7 and my computer turned off..i waited for a bit because i know it restarts alot during but it didnt come back on, i turned it on and there is no boot screen and none of the ports on my computer work no video no usb, i would be upset right now but im so lost in trying to figure out how to get anything to work...please help 

EDIT: This appears to be a double post. Someone please delete this duplicate.