How can I test out a used computer to make sure it is fully functional/ with no problems?

TonyTheBulgarian

Commendable
Oct 21, 2016
1
0
1,510
Basically I am getting a really good deal on a used PC. But before I actually purchase it I would like to test it out with programs that stress it/ check for any errors/ see if the components are fully functional. My question is which programs should I get? As in what program would be quick enough to where we don't have to sit around and wait for a whole game to download so I can test the CPU/GPU