For future reference, if you use GooGone or the like to clean your CPU/heatsink, then you need to go back and thoroughly clean that crap off with rubbing alcohol. Also, I'd recommend getting some Arctic Silver 5 thermal paste, the stuff that ships on the packaged heatsinks is usually not that great, though of course it still works. You can get it online for pretty cheap, of get it at Radio Shack for $10. Put a rice-grain sized drop on the top of the CPU die, then use a credit card or a razor blade to spread it evenly, and paper thin across the CPU, corner to corner.