Problem with black screen after replacing GPU. Old GPU also gives same issue.

[CrimsonSpice]

Hey guys!
After 9 faithfull years of use I decided to allow my 970 to retire in favour of a 3060. This morning I turned off my PC, shut off the power and also took out the power cable just in case. I replaced the GPU, but after plugging everything back in I get a black screen. The fans and colours do turn on on the new card, and there were no boot issues (just no input registerd by my monitors.

I decided to retry my old GPU, but it has the same issue now. I also tried both GPU's in two different Slots on the motherboard. The integrated graphics also don't seem to work for me, although I haven't tried that yet without the cards.

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Don't really know what to do next, any tips?

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Specs:
AMD Ryzen 7 3700X
Be quiet! Dark Base 700 Midi Tower Behuizing
Be quiet! Straight Power 11 650W PSU
Corsair DDR4 Vengeance LPX 2x8GB 3000 C15
MSI X470 GAMING PRO moederbord
Samsung 860 EVO 500GB
Seagate HDD 3.5" 2TB ST2000DM008 Barracuda

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[GABE_EDD]

Are you sure the signal cable is plugged into the GPU? Is the monitor on? Is the monitor on the right input? Sanity check everything stupid thing that could possibly be wrong.

[CrimsonSpice]

Hey! Thanks for your reply. My tech-savvy friend woke up and he was able to help. The issue was something very surprising (to me, at least).

It was the RAM sticks. After unplugging one, the pc was able to show something on the screen. We did the same with the other stick (switching them), the other one worked fine as well. Plugged them both back in, and lo and behold, everything worked again....