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misbehaving EDP!

Hello to you all,

I recently bought a used Oberheim EDP with loop III and 2x 1meg and 2x 
256k simms in it.  It worked fine when I got it.  I then put in the 
loop IV chip (thanks, Kim).  It worked fine.  After much searching I 
finally found 4 4meg simms to put in.  I put them in and it 
showminutesed the  full 198 seconds upon start-up.  Now I started 
having intermittent (then more frequent) episodes of full volume nasty 
noise on the output whenever I tried to record.  An amazing noise, 
really...I enjoyed putting it through effects and making Autechre-type 
sounds for a full five minutes or so, but then decided that I wanted a 
lightly more flexible machine...  I assumed that one (or more) of the 
RAM sticks was suspect so I started to swap the sticks to see if I 
could find the culprit.  Now it seems that the machine will not 
recognise ANY of my simms in the front two slots.  I have 2 4megs in 
the rear slots and it SEEMS to be OK (albeit at only 100 seconds).  I'm 
keeping it warm now to see: I have gigs this weekend...you know the 
routine.

So.  Are the RAM slots damaged (my problem all along) and my fiddling 
did them in?  Problems with the OS or other components?  Should I try a 
parameter reset?  Or something more radical?  More to the point: has 
anyone experienced similar problems?  I did check the archives, but 
found nothing similar.

If I'm truly up the creek, does anyone know of a place in Canada (S 
Ontario, preferably) that could fix 'er up?

Thanks very much!!!!


Regards,

Ben