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graphics card stressing, perhaps something like futuremark or maybe even atitool (http://www.techpowerup.com/atitool/) which will let you run a stress within it (obviously don't overclock anything unless you want to).
Ill give Prime95 a blast on some known broken machines and see what it can detect to see if its the tool for the job. Sick of fixing up machines, selling them and when the customer takes delivery they suddenly stop working.
IBM T series and Dell C series laptops seem to be the main culprits for this.
Not so much worried about software problems etc as most machines are imaged from master images and 20mins reimaging something fixes any software issues.