Ds-7604Nl-l1/4P not powering up

Are you sure of that model number?

Please clarify, perhaps with some appropriate punctuation: The red LED flashes when powered up but stops flashing when the hard drive is connected?

Is it the same NVR that had power problems back in June?
 
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We usually write off boards like this, but i'd check for validity of that hdd as well.

If you are broke and cant aford another one, remove plastic, and put in oven on 180 degree 10 min, cool it down, re plug and try.

It will fix bad soldered pins if thats the case.