Question Can't identify the problem but computer so

[Hydrophobicwalrus]

Yesterday my pc wouldn't boot. The cpu led remained on (naive as this sounds I can't remember if that's normal or not. But the vram led would blink on and off every few seconds while the led display would go through several errors. At first I assumed it was a ram issue and tried to replace the ram with new ram as I wanted to upgrade too. Then I tried again but the same issue persisted and I noticed at this point the fans would run and the led too but the gpu led indicator wasn't on and the main led's for my mobo were off. When the ram is out there is no blinking light on the vram. I can't work out what part is faulty. I tried to swap my psu but I think the spare I have is dead because it won't power on the pc. Any advice would be appreciated

 

[rgd1101]

full system spec? include make and model of the psu