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  • This sounds like an under powered PSU, and when your CPU/GPU draws too much current your PSU power-cycles. Hoever, 1200w is more than enough. Are you using seperate looms/rails for the molex connectors, GPU and CPU power? Commented Oct 24, 2019 at 12:06
  • The GPU need two X6 cables and the cpu one x4. I've tried to start the computer without the GPU, the same problem occur and it was working perfectly fine for years.
    – No name
    Commented Oct 24, 2019 at 12:37
  • Maybe the PSU is getting weak after years of use.
    – Moab
    Commented Oct 24, 2019 at 12:54
  • Can you get into BIOS or does it loop before getting that far?
    – Smock
    Commented Oct 24, 2019 at 13:48
  • I can't get into bios sadly
    – No name
    Commented Oct 24, 2019 at 14:03