Question

Here's the thing.
A JVC KD-HR50 car stereo was installed into my car. It was playing well all day but then later in the night, I was trying to skip a cd track and i mistakenly hit fast forward and then i couldn't get it to play. So i turned it off then it wasn't powering up back. I reset it and then it came on but now there's no response to when I try to change volume or even hit eject. Any help?