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Intermittent no POST

MrChalky

Specs:

  • AMD Ryzen 5 5600X
  • MSI MAG B550 TOMAHAWK
  • Corsair Vengeance RGB PRO 32GB (2 x 16GB) DDR4 3600MHz C18
  • Corsair RM850x
  • NVIDIA GeForce GTX 970

 

Every single time I try to boot, the first time it doesn't post. some rgb lights turn on, but there's no one home.

I press the power button again (short press) - it shuts off, and when I try again it boots fine.

Even if the computer has been on for a while, if I shut it off, and try to boot up again straight away I get the same issue.

Always fails the first time, always works the second.

 

I've reseated everything, checked all power cables. PSU is new enough, but it was working fine in a previous build.

 

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When it doesn't boot, VGA debug light remains lit

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