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So, the PSU voltage switch is for setting input voltage. You might be running it on 110V instead of 230V, though unlikely but it doesn't hurt to check.
Checking the y motor and endstop wiring I recommended because I had a similar problem on my x-axis when my motor wire and endstop wire came loose, where the motor was jittering and buzzing, but not moving.
The .cfg file is the configuration file for Klipper firmware, which is taylored for your printer. Since you said that your firmware issues got fixed I don't think that's it, but if nothing else, redownload and reinstall the .cfg file and if that does not help, reinstall klipper as a last resort. Do so only if nothing else helps.
If you need more help, I could help you through video chat. Just DM me.
If anyone is interested, the problem was due to packing material not being completely removed from under the printbed.