Friend's PC is Running Slowly

DaithiTF2

Honorable
Nov 11, 2013
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Recently my friend's dad unplugged the wire from his PC's power supply. After that, it has been running much slower than before. Is this the cause of the sudden slowness or could it be something as simple as a spontaneous case of wear and tear starting to kick in?

(I will be updating this thread with his specs when I ask him to send them to me).