Pc peripheral‘s,monitor keep shutting off and Pc restarts.

[RyanPowers98]

My girlfriends PC started crashing yesterday when she was on photoshop. She restarted it thinking it wasn’t an issue but after a couple seconds of it being on the fan lights dim down in the pc case, her peripheral‘s shut off then back on, the screen goes black and goes back to booting up. This happens every couples seconds of the PC being on. I switched out the PSU and the problem still occurs. took gpu out and still occurs. Decided to take all the ram out (gpu was still plugged in at this point) and the problem didn’t occur. I got extra ram i had and put it in the system and it happens again. Took out CMOS and put it back in, still occurs. Tried to install new bios to MOBO and still occurs. I’m thinking it’s the motherboard but don’t know why when the ram was taken out it was perfectly fine. Could be the ram slots on the motherboard that went bad.