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#31
I experienced a similar problem at home once with a Dell computer that I had. Ended up being 1 bad ram chip...which of course was bought by myself from crucial.com so I cannot blame Dell for that one.
I agree with the others that you should try to clean out as much of that dust as you can, get the side back on the case for better airflow and add at least 1 fan blowing hot air out of the back.