I tried to overclock a core i7 870 to 4ghz which it should be able to do. I have the gigabyte H110m Pro-D motherboard and 8gb of ram installed. After overclocking (or attempting to) the PC started and the fans spun but nothing showed on the screen. As if there was no input. I have taken out the mobo battery and unplugged the psu and then held in the power button for about 2 min. Still haven't solved my issue.