I turn on the pc but there is no signal on my monitor also I'm trying to repair it and I think it might be the mobos fault because my cpu won't lock in to place
if that does not work then then look for this http://www.computer-hardware-explained.com/image-files/clearing-the-cmos.jpg
its the cmos jumper pins take it out of the 2 pins its currently in and then put it in the two pins on the right i think if its in the pins on the right then put it on the pins on the left (there are 3 pins) take it out for around 10 seconds and then put it back in.
i seen this problem lots of times im sure you not stupid and have checked the cables in the back of the pc and monitor.