|If it came pre-applied or had a pad then that is good enough. The problem lies elsewhere.|
Did you bench test the board?
Here is a post on how to bench test by jam.
Best way to troubleshoot hardware is to strip it down to the bare mininimum, then go from there. All you need to be able to boot is the power supply, board, CPU w/HSF, ONE stick of RAM, video card (or onboard), keyboard, & monitor...nothing else. All other cards should be removed, all drives should be disconnected (power & ribbon cables), no mouse, no USB devices.