Buying second hand system - what quick stability test would you run?

[Puzzled]

Hey

I'm going to look at a second hand pc this weekend and was wondering if its worth running a quick stress test before handing over the cash.

Anything you'd recommend to run that won't take long, sort of a quick torture test.

I know for proper stability a much longer check needs to be done but I was thinking more to see if it overheats quickly and turns off.

Thanks

 

[Puzzled]

Thanks, sorry forgot to say its a laptop.

I've had laptops turn off or throttle themselves under normal use due to the cooling losing its effectiveness (dust I'd imagine) so just a quick way to rack the temp up.