Signs of a dying power supply?(random restarts)

Ego Banana

Reputable
Aug 22, 2014
23
0
4,520
For the past few months my computer has been powering off at random times while playing a game. Usually the image would lock up and have a short buzzing loop of the sound. The screen would then go black and the computer would restart.

I've had this PC for almost four years now and i'm not sure if its the power supply.
My system is a Dell Studio XPS 435T with a nvidia gtx550ti graphics card.

It would be nice to have confirmation that this is in fact a dying PSU before dropping cash on a new power supply. Thank you.