This just happened to my empeg too. It hadn't been installed
in the car for long, but from what I can tell the installation
was done correctly.

I haven't got a reply from empeg yet, but I expect the problem
will be similar to yours. I just hope I don't have to send it
all the way back to England to get it fixed.

The unit is still usable, as long as I can remember all
the menus.

Here is an interesting side-effect:
With my display dead, I no longer get any pop when I turn
off the ignition. Not even a little bit. It is just
completely quiet.

Maybe if the display is shut down immediately when power is lost,
the pops would go away.

Richard.