I have a MFC-L6900DW that is locked up. The unit is 10 months old, and when plugged in, will not come to ready. When I power it up the Home button lights, then the back and cancel buttons light within 1 second, so all three lights are on. Touching any of the buttons does nothing and the power on/off button does not work. The only way to power it on or off is with the power cord. There are no sounds no fans not anything. I swapped the power supply board from a similar machine and it made no difference. I am thinking main board or control panel. I am open to any suggestions or ideas.
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