Graphics Card Black screen, now won’t boot

Hey all please help... sooo started with typical black screen no cursor.
Booted with safe mode on uninstalled graphics driver then downloaded new driver but wasn’t windows signed so had to turn off the signature setting to install. So black screen wouldn’t happen on windows driver but when I started installing the amd Radeon driver it would go to black screen while installing. And would hear disconnection sound over headset.

Decided maybe the connection was bad so powered off and cleaned ram slots, graphic card slots. All plugged in correctly but now the computer won’t boot, turns on case fan working fast, but CPU fan slow and graphics card fans start and stop.

Is it my PSU failing me or do I need a new graphics card?

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