Considering the it may be hardware, I have had some luck in removing the MFP board dousing it (particularly the connections/ports) with contact cleaner and reassembling. Also check for bad caps (pretty rare, but still) or worse burns, etc.
Also, I am not terribly familiar with this machine, but some MFP boards require the RAM to be installed in one particular slot (bottom one--if memory serves)
...What happens when you disconnect the HDD?
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