No power to ACC fuse and no cranking

[Kevfra]

Installed a AVIC D3, operated it fine before mounting after I'd done all the wiring, and had to leave town for a few days so I left it sitting still hooked up but not installed. Came home - doen't play and car won't start. Panel lights up but no crank at all. Battery is fine. ACC fuse blown. Replaced but still no crank, and no power to acc socket either. Using a DMM I find no 12VDC at the acc socket with the fuse removed. Like something big popped and even though it blew the fuse it took out something else? Would this stop the car from cranking? Seems mosre like some immobilizer feature, like maybe my key programming got erased or something. Even changed the ignition switch but no change in problem. Help?