Yes, the HC will operate the mount without the computer being connected.
It is important to listen to the sounds when the mount starts up. You should here 2 longish "whoopish" tones initially shortly followed by 2 short beeps. The two short beeps may sound like a single beep if they happen at the same time. Those 2 short beeps indicate that the mount has initialised and is ready to home. If those beeps do not sound it can mean several different things, but basically indicates that the MKS5000 is not communicating with the motor(s). It might be the MKS5000 board, bad cable(s), or failed encoder(s) on a motor.
The fact that neither axis appears to move on the homing command may narrow down the list of possibilities given that it would take 2 failed encoders, 2 bad cables, etc. The failure is more likely to be a bad board or cables that have pulled out of the board. That you can connect via USB to the board seems a good sign so it will take some investigating. The start up beeps are your first clue as are any flashing lights after startup.
HTH
Peter
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