I know you just sent it out for repair, but they said that it was working when they shipped it back to you, and it DID in fact work for a few hours when you got it back. This is proof that they were not lying.
But you should realize that just because something was serviced (and working), that doesn't magically prevent something else from breaking on it (even if its only minutes later).
I'm going to retract my earlier post saying that the power supply isn't the problem, and amend it to say that the power supply "probably" isn't the problem, since I've visited your other thread and read about the other symptoms. You definitely have something on the 5V rail, since the processor is working. Does the video come back if you remove the accelerator?
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