PT Cruiser Radio Problem

Like the title says, I have a 01 PT Cruiser that we changed the battery in
and now the radio doesn't work.
Everything else works, all fuses good.
Been to the dealer and they say no security codes in 01.
The radio/cd player has a two slide eq that blinks on and off.
I've scoured the net for answers to no avail.

Anybody know what the flashing lights mean or how to reset or repair?
Thanks in advance.
Carl
Ive seen this before, and if I remember right all we did was disconnect the negative battery terminal for about 5 minutes, hooked it back up and all was well again.