OK, observe how the machine behaves, if it works fine without any problems for next couple days then it might have been something temporary. However if capacitors are faulty the machine may sometimes work fine and then suddenly hang or refuse start. For example I once had PC which had motherboard going faulty because of capacitors, it required two start attempts from cold, first one resulted it hanging on bios screen, power down and power up, then it worked fine until I powered it down, then same thing repeated.
You may try running something processor intensive, HD flash video, Geekbench etc.