Radio not turning on; AVH-280BT

Check the yellow and red power leads in the deck's wiring harness and make sure they're both receiving power. There might have been another fuse somewhere in the chain that blew. Also check the replacement fuse in the deck - these little fuses are easy to insert incorrectly and they can even fail when they look like they're fine. The deck's fuse has two tiny metal points that you can use to test - make sure there's +12v at both of the fuse's points. If there's power to both leads and the deck's fuse is good, then try "hard" resetting the deck using the procedure in the owner's manual.