Has he cleaned out the dust and put it in a well ventilated area?
Dust is the stability killer, it clogs up heat-sinks, causes connection errors etc etc.
Take the case outside and give it a proper blow job - lol.
I like to troubleshoot the basics first - dust, psu, ventilation, ram.
It's the equivalent of checking that there's fuel in the fuel tank and oil in the engine - seems simple and yet people run out of fuel and oil every day.