Chosen Solution
Sure sounds like your power supply is going bad. I just had to replace mine —- it’s pretty simple to do, all the plugs to devices and the motherboard are designed to only fit one way. Too me about 20 minutes to rip the old one out, and slap the new one in. ALSO: most video cards today require their own power supply cable- it’s easy to pull it loose if you were monkeying around on the inside.
