I recently picked up a used 4 camera processor. I tried to power it up using
Did you try powering it up with the proper power supply?
There are a number of reasons why it wouldn't respond. You still haven't mentioned if you're using the power supply that came with the unit. Chances are (because you haven't mentioned it), you're not. Which means you're *assuming* the input required is 12VDC. Then there's the matter of the adapter plug... If you have the wrong polarity, you're liable to not get it to respond at all...
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