My computer isn't showing anything on the Display. the computer will show the lights on the motherboard and the fans will turn on but the screen shows nothing but black. what are the troubleshooting steps i need to go through? the computer was crashing pretty frequently but i never wrote down the codes(like a dummy!) any help is appreciated. sometimes(before it did this wouldn't do anything thing) if i let it sit it would work. but now nothing. Please help!