Question Custom PC build not displaying anything after starting up?

Mar 11, 2020
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I bought a cheap custom build to play some games I can't play on my current computer, but it doesn't seem to display anything. Everything seems to start up, but I can't figure out what's wrong with it. I've tried a different graphics card and motherboard, but it still has the same problem. The PC speaker doesn't indicate that anything is wrong with the CPU, and everything appears to be hooked up correctly. Specs below.

Motherboard: ASRock 970M Pro3
CPU: AMD FX-4300
GPU: GeForce GTX 660Ti
RAM: 8GB DDR3
Power supply: EVGA 600 GD
2TB HDD

Sorry if my post isn't up to the standard of this site, and sorry if I didn't give enough details, I'm very new here. Thanks in advance!