Question PC wont turn on until I re-seat various things

[Amirq1121]

I built a new PC about 6 months ago and its been working just fine. About 1 month ago I replaced my GPU and power supply. Everything has been running smooth up until 3 days ago I went to go turn on my PC and it wouldn't boot. I got the CPU debug light, all my lights and fans were on but no display. I've re-seated the RAM, re-seated the CPU and re-seated the GPU. Everytime I re-seat something, the PC will boot but then when I go to turn it off, the next time I turn it on it will do the same thing. Last time this happened I reseated the GPU, which then caused it to boot. I powered it off, the next day I tried re-seating the GPU again and it didn't boot. So I re-seated the CPU and then it booted. The next day I go to turn it on and the same thing happens. This time I re-seated the CPU power connector and that let it boot. It's like everytime I re-seat something it's crossed off on a list of things that will work the next time. I'm so confused any help is appreciated.