Just wanna say I'm no expert. I would double check that everything is properly connected to your mobo first (RAM seated properly, GPU fully seated etc). If that doesn't fix your problem I would think the likely culprit is that mobo. You could try to track down a used one for cheap and see if that resolves everything. Maybe try your GPU in another machine and see if it has any issues first. All that said, it sounds like upgrade time. You could build a machine that would smoke your current computer for like 600 bucks.
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