|Your mboard, or sometimes the cpu itself, has afeature that shuts off the mboard when the cpu temp gets too hot.|
If this has been going on for any more than a very short time, the cpu may already be damaged.
There's no way a properly installed proper heatsink/cpu fan combo should ever allow the cpu to get that hot!
Did the heatsink/cpu fan combo come with the cpu or did you use one you got separately?
Are you overclocking anything, or have anything to do with the cpu set to non-standard settings, particularly it's core voltage?
Did you or some other amatuer install the cpu heatsink?
If the heatsink is not dead flat ontop of the cpu, and/or if you neglected to install a thermal pad or thermal paste or thermal grease between the heatsink and the cpu, the cpu will overheat very rapidly.
If the thermal pad is damaged, you scrapeit off and replace it with another thermal bad, or either thermal paste or thermal grease.
If it had thermal paste on it that has hardened, you must scrape it off and use a thermal pad or thermal paste or thermal grease.
- I recommend the thermal grease because it never hardens - e.g. silicon thermal compound - it's translucent rather than opaque when in a thin layer.