first of all, i would reseat the cooler to make sure it's on right. make sure you see a full cpu square mark on the bottom of the heatsink to see if proper contact was being made. No, overclocking is not like that, it consists of going into the system's BIOS and tweaking some of the settings to make the CPU to faster. No one will get 4GHz on air. You would need dry ice or LN2 or something like that.