I think at this point it's best I just buy a new printer and use this one for parts!

I have checked the wiring and it's all good.

My Ender 3 worked fine for about 3 months until I installed an EZABL and when I tried a test print my printer died as if someone just turned the power off! the next day I reversed my steps and my machine came back to life!! however, I noticed the hotend was heating up without my intervention, after some troubleshooting we discovered it was a bad mosfet, I replaced the board and to my disappointment, the bed now overheats without my intervention! so I replaced it with a MKS GenL v1 (as there were many tutorials and guides) same issue!!! I have just replaced it with a Duet Maestro and I still have the same exact issue of the hotbed heating up as soon as I power on the printer without me doing anything! Any help would be greatly appreciated!