Here's my PC specification:
PSU: Corsair RM850x
MB: MSI Z170A Gaming M3
RAM: 2x8GB DDR4
GPU#1: MSI 1080 Ti Gaming X
GPU#2: MSI RX 580 8GB Gaming X
The GPU#2 is connected via riser, separated from GPU#1 to keep temps low.
MB BIOS are up-to-date.
Heres what happened:
The GPU#1 were not overclocked, underclocked, or BIOS modded in any way.
The GPU#2 were not overclocked or underclocked. However, it was BIOS modded (the timings, hynix memory, yadda yadda). I also used the AMD "Blockhcain Compute" driver:
I mined using Nicehash, with GPU#1 running Equihash or Lyra2REv2 and GPU#2 running DaggerDecred or DaggerSia most of the time.
Everything was fine. Both temps were about 70 C, fans were about 30%. Mined 24/7 for about 3 weeks.
However, then suddenly my PC died and won't turn on.
Interestingly enough, when I removed both of the GPU, the PC boots up into windows normally. Looks like this: http://imgur.com/a/h2Lrs
Plugged in GPU#1, works fine.
However, when I try to plug in GPU#2, either into the upper slot of the motherboard, lower slot of the motherboard, or even using the riser, it turned on for like a split second: http://imgur.com/a/Z57JY
And that's it. It won't turn on. I can't even get into BIOS/UEFI. The RAM is blinking like when it's on standby mode. Everything else does not turn on.
Could you help me? What should I do?
Update: Upon further testing, I noticed that the PC can't power the GPU#2 (even if its not plugged to the PCIe slot). Only by connecting the cable from PSU to the GPU#2, that this PC can't turn on. GPU#1 is 100% fine.