Id take this back to basics.... try a trouble reset function to see if the display will come to life and if it does UNSET the scanner again. First rule is if it was working before you changed something then you caused the fault.
If the machine does not boot i advise going through the troubleshooting guide for the no boot SSD problems TNEU1400013EN. It also notes in here a C-6756 code issue, which states to do a system error clear.
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