[sdiy] DX7 diagnostics help

[mrmike]

I've got a DX-7IIfd with a Grey Matter E! card in it.  It hasn't been  
used  in years, but was functioning correctly. I fired it up last night, 
and it has a problem:

It boots, and I get the E! v 1.20 message on the LCD. LEDs, etc. seem to 
be ok.
Problems:
      I can't change patches, and the unit produces no sound (at least 
with this patch).
     Split mode button looks like it works (two patches appear in LCD)
     There are some garbage characters at the end of each line in the LCD.
     Turning the volume up just gives hiss.

I'm not at all familiar with the E! card, so it could be straight user 
error. I've found the manual online, but troubleshooting help is sparse 
there.

I haven't tested MIDI out.

Anybody have any suggestions on how to go about fixing this? Should I 
remove the E! card, or is there some way to reset it? Could this be a 
battery issue?

Thanks for any help!

mrmike