Question : Problem: Core 2 Duo overheating

A friend has an E6300 running on an MSI-V7255 motherboard. He replaced the graphics card with an 8800GTX and changed cases at the same time.

In doing so he broke the CPU cooler and replaced it with a stock Intel cooler... but Coretemp reports an unlikely 123C(?) for both cores at idle, Speedfan Core temps of -39C thats minus 39C.

MSI's own utility , Dual Core Centre simplt reports the CPU temp as 68C, this duplicated by Speedfan.

I don't like the look of it.

Answer : Problem: Core 2 Duo overheating

Should be a Hardware Monitor section in BIOS with CPU temps.

Thermal compound --> remove HSF, clean compound from heat sink and CPU using isopropyl  alcohol, apply new thermal compound and reinstall. Use manufacturer's instructions for applying thermal compound - a thin layer is sufficient. If you are not familiar with removing and installing an Intel HSF, post back.

Was old stock cooler rated for E6300? Most Intel Socket 775 coolers should be adequate.

Check 4 HSF retainers before doing anything else.