Okay, assuming that you haven't left any plastic wrap on the coldplate or didn't apply thermal paste if it wasn't preapplied, then you may have a temperature reporting issue. Maybe try checking your CPU temps in the BIOS. If it's idling at 30-40 in the BIOS, but CoreTemp or HWMonitor says something different, then it's likely a reporting issue, and you may want to download newer versions of those programs if available, or try doing a BIOS update and see if that helps. If the temps are high in BIOS, then there is something wrong with the cooling (more likely), or possibly the CPU's temperature sensor (less likely).