On further examination the power supply in my gaming PC *is* blown after all. It’s spinning the fans but nothing else is powering up. The mobo doesn’t begin to boot, the disks don’t spin, the CD trays won’t open and the graphics card’s fan doesn’t spin. I still believe the graphics card is burnt out because of some of the original symptoms, but I might get lucky.
I shelled out for a new case and some water cooling kit