Check your risers they be burned.
are you sure that "burned raiser" is not an urban legend?
bad molex contacts is something I encounter very often, but actually burned raiser is something that I haven't seen yet, but then maybe I'm just that good

Yeah I had a burned molex (peripheral cables)... It actually burned out on the PSU itself and damaged one of my outputs. Have just ordered a new cable from corsair and used a different output... What could have caused this? Can I do anything to prevent it? Could a claim be made vs corsair for warranty on my 1200w PSU?
How many things did you have plugged into your molex line? Did you use a corsair cable or a different brand?
3 RX480's N+ 4GB on each with the final socket unused. Corsair that came with it
That was your problem, you can only put a maximum of 2 on a single molex cable or you risk burning.
So what I should only have 2 on a 4-6 adapter? I mean its worked for over a year no problem but then its burned it. Because its damaged the slot on the PSU I also now don't have enough slots to buy extra cable and extend it.
Whats the other option? I'm not even sure what to call the adapters I could use as replacement. The peripheral cables were hard enough to find and had to go corsair directly for it :/
On another note... Who here mines with Nicehash to be paid in BTC? Was by far most profitable mining for me... Is there an alternative to nicehash that I can keep using through Claymore?