Just built a computer for a friend and everything is working absolutely fine. However, when we boot up the computer it comes up with an error saying 'CPU over temperature error' - we then press F1 to enter the BIOS. In the Bios, the temperature shows about 80 C and then cools to around 50 C within around 20 seconds. This happens pretty much whenever we restart the computer.
When we start windows and test the temperature using HMonitor and Speedfan - the temperature shows around 40 C ( what it should be - idle). I'm not really sure which to believe - we've reseated the heatsink many times.
Any advice would be great.
i7 2600k with the default CPU fan!
Zotac GTX 570
Corsair 600t Graphite