I’ve been having the same problem with mine. It worked just fine when I bought it used then all of a sudden it stopped working. I did the same things you did, i played with the wires in the back and stuff, i even removed the unit from under the passenger seat to try to clean it out and put it back but no power.It stayed like this for about 4 to 6 months (didn’t really pay attention to it) then out of the blue it started working again. I kept it on and didn’t mess with it cause I didn’t want it to go again. The battery in the car died one day and I needed a jump. Since then the dvd player never turned back on. I’m hoping it will just start back working and will stay on until the end of this year after I get back from my trip to South Carolina. But I could use some help with this issue as well.