Originally published at: http://www.howtogeek.com/172933/how-can-i-test-my-computers-power-supply/
You’re concerned your computer troubles stem from a failing (or outright fried) power supply unit. How can you test the unit to be sure that it’s the source of your hardware headaches?
Semi-related: Sometimes when I'm playing higher-end games, my PSU makes a high-pitched kind of chirping (or something similar; it's been a while since I've played) noise. Should I be worried about this?