I've gotten myself in some pretty deep ****. I agreed to fix a friends old gateway computer, and after opening it up and doing tests on the cpu, ram, etc, i made it worse. When the laptop came to me, the fans would start and you could hear the computer running, but the screen would stay completely black when you turned it on. Now, the computer doesn't respond to pushing the power button at all, except for a slight change in pitch of the sound the power board makes as you hold the power button down. Any help would be appreciated because this guy is waiting for his laptop and all I've done so far is make it worse.