Am I screwed?

Hey everyone, I was busy upgrading my ender 6 with linear rails on al axis, after 2 days of work it is finally done! But when is turned on the printer there was this horrible noise coming from the stepper motors, I am very sure I didn't screw up any wiring of te breakout board.. I added some extended wires to make everything fit, but that's it.The noise startled me so I quickly turned the printer off again, this happened about 3 times. Now the printer won't boot and the steppers keep making the loud buzzing noise. Is my main board dead? I am almost sure it has to be coincidence. (I flashed the firmware to Marlin 2.1 about a month ago, that worked fine!) I have had the printer for about 2.5 years at this point. Any info is appreciated!