random crashes

[JB]

Andras Simon <szajmi <at> gmail.com> writes:

> ... 
> If X runs, then it dies and only a blank console with a cursor at the
> upper left corner can be seen for half a minute; then reboot starts.
> Otherwise, there's a longish message on the console about a machine
> check exception, saying a lot of things, such as 'panic occurred,
> switching back to text console'. This is the message that mentions
> mcelog.
> ...

Get familiar with this:
http://www.cyberciti.biz/tips/linux-server-predicting-hardware-failure.html

JB