I bought a ream of CDs at staples last week because they were wicked cheap. They're the "printable" ones with some sort of a paper finish applied on one side. I don't have a printer that works with those but the price was right so I bought them.
My wife burned a CD and, the next day played it in her car. I played fine but, the next time she got in her car it wouldn't eject. The player just said "No Disk"
She was ready to start sticking pliers and junk into her CD slot but I googled the resolution: turns out all you need to do is pull the fuse and stick it back in. This resets the radio's memory and, upon powering up, the player ejects anything inside it.
Of course, when I first tried this it didn't work. After 20 more minutes of reading the manual and putzing around I discovered that, at least in my wife's car, there are two fuses labeled "audio" - the first one I pulled does in fact shut off the radio - but it doesn't reset the memory. The second one did the trick.
Just thought I'd share.