If the printer does not power on, first thing to do is power off the PSU and unplug the AC power cord. Also unplug the USB cable if it is currently plugged in. This just ensures no power will be present when we go to examine the wiring.
If the problem still persists and PSU provides power. Remove the RAMBo from the housing and try to disconnect everything except the PSU and LCD panel. If it doesn't light up, please contact our support team. If it does power up, add one component after another and you should easily find the problematic part of the printer.
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