Have an 07 Tahoe LTZ that we just bought used, RSE screen worked when we got it in February, now doesn't. Nav screen works w/ truck in Park, goes off when in gear as it is supposed to. Headphones work all the time. Rear screen doesn't show movie. Any tricks? Spent hours reading manual, fix-it manuals, & Googled all possible ways to ask this same question to no avail. Help! My 13 year old wants to watch movies as we travel!

 

Try to eject and to re-insert the DVD. Does that turn the screen on ?