Stereo Wiring Help Please!

[pow]

Really odd one this.

I put a stereo in my cus's 03 9N polo and the stereo sunk back into the dash. She popped round tonight and I readjusted it all, put it back in and now it doesn't work unless it's hooked up to a perm live.

I've probed all the contacts with my multimeter and there isn't a switched 12v. I just don't understand it what so ever because it was working on the ignition before. I've not blown any fuses or done anything, just don't get it.

Any ideas?

[fonzooorooo]

A wire's not come disconnected from the ISO plug, has it?