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check your easiest most basic things first. Fuses, Relays, which you already checked grounds next. Then I would start testing wiring circuits by doing continuity test and voltage drop tests.
It does sound like the immobilizer is cutting power to the starting circuit and the DME. That may be the reason your OBDII port is not getting power.
I have read the immobilizers circuit board is prone to corrosion problems as it is not sealed against moisture so humidity in the air could possible affect it.
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