i am having the same problem actually. When i first got it i tested it with AC adaptor, worked fine. Today i connected ground (black), constant (yellow), and switched (orange) and tested each wire many times with a meter to double check. But the Rio still won't power up. Is it possible to ship my new player with it stuck in "home" mode?

it's not my car either, i switched back to stock HU and it worked. Battery is giving out 12V.