Well I am betting, it's the power supply.
I would still pull the CMOS battery and wait 30 seconds and replace it...but it sounds like the power supply. CPUs don't really go bad that often..hardly ever.
It could be the vid card in the motherboard, but that's a pretty crappy power supply. So, that's where my money is.
/e Yeah the nickle sized battery is the CMOS battery. Shut the computer off, turn off the plug strip...then pull the battery, wait 30 seconds and replace it.
But, I'm still betting that it's the power supply.
You can test the power supply, out of the case, by doing the paper clip trick...
http://aphnetworks.com/tutorials/psu_paperclip_trickWith the 20 or 24 pin connecdtor shorted as shown, the fan in the power supply should spin.
Also you could just take the power supply to BestBuy and they could test it for you.
http://www.bestbuy.com/site/insignia-520w-atx-power-supply-silver/5610116.p?id=1219144863171This post was edited by Ghot on Aug 21 2016 06:59pm