gpu won't start

So today i upgraded my cpu from a ryzen 5 1600 to ryzen 9 3900x and after the install, my PC won't boot. The mobo is on, but i dont get a beep like usual. The case fans, cpu fan and psu fan are all on, but my GPU keeps attempting and failing to start, and the PC wont even boot to BIOS. I made...

Hello, I have a Dell Optiplex 330 that is connected to my TV and I watch movies with it. However in it's current configuration, the gpu struggles to show the movie in video and it becomes more like pictures. I want to know what is the best GPU that my system can take. It would be the best if it...