BFB 3000+ not powering on

I recently got given a broken BFB 3000+ from my school with the task of fixing it to keep it. The problem started when the power cable to the control unit became frayed/bare. I replaced this and still the control unit’s power LED isn’t lighting up when switched on. All the working/moving parts are in good condition- so i’ve been left to reason that the broken power cable has caused a fuse to melt or fried the electronics. However I’m not certain this is the case. If anyone has any theories, suggestions or places I could take it, it would be greatly appreciated. Also if anyone knows of any fuses that could of shorted that would be greatly appreciated, thanks for your time-