Yeah i agree with this.
The RX 6600 is the best ultra budget (under $200) upgrade, though the RX 6650 XT and RX 7600 project to last longer as viable upgrades and are still under $250.
The 6600 is slightly weaker than the 5700 XT which is still a valid card today
That cpu doesn’t have integrated graphics, but if you try it without a GPU do you at least get a POST beep?
Do you know if the PSU is good?
I recognize that with the age of this post you’ve either figured it out or moved on but I’d still be curious about what happened next