Stock HU stop working.
 

Hi, I'm an owner of a 2006 mazda 3

About a month ago I installed an amp and subwoofers using a LOC behind the headunit. The installation went smoothly and nothing went wrong for about a month. Today I was driving and the headunit had full power and display was working. I pulled into my girlfriends drive way and turned it off. When I started my car about 15 minutes later there was no display nor music playing. The eject disc and load disc buttons still work. When I turn my headlights on the headunit lights up besides the display. Please help. thanks

did you cut into the power to run anything to the amp? Twisted wires can come untwisted, or something may have shorted out and blown a fuse.