Same issue here!
Replaced powersupply once, luckily no more. 2 years of my (then high-end, now old) computer being unusable. Constant screen crashes and other issues. Culprit? Thermaltake core P5 riser cable.
Had this been a fair world, TT would have owed me a shitload for having this computer on the wall aging. But I realize that won't happen. However, a replacement cable should be offered. I've sent them 5+ emails, been forwarded once, then 3 weeks of getting ignored. No responses to emails, NOTHING.
Going out and buying a cable. Shame on you TT! Never buying from this crap brand again. 0 quality control, and -1 customer service.