Korg Poly800/EX800 Users

I recently bought a non working Poly 800 MK1.  The previous owner said it made strange noises.  I thought I could load the factory patches (like I have before) and bring it back to life.  No joy. I tried that several times to no avail.

So far I have replaced the batteries and loaded the factory (WAV) patches and it still does the following:

Some patches make a low volume sound/noise - others do not.  The filter and other parameters available on the grid seem to affect a change in the sound but it is hard to say if they are working correctly.

Any ideas?

Thank You

Great questions.  Thanks for the response.  I can answer most of these.

I did get a GOOD on the LCD after the Load (write was enabled) - although after going through the parameters for the factory patches, they did not match.  Joystick and sequencer seem to work and so do all the keys (they all make a noise).

I have not tried to write a patch (I'll try that).  Looking inside, everything looks good (no apparent damage).  The pitch is interesting because some of the patches that make sounds are wobbly.

I'll see if I can write patch and check the other things and post back...

Here's an update:

After checking the parameters for the factory patches, I noticed they were not correct. So I manually entered in patch 11 and low and behold it made sound (it was a string patch).  However it was still wobbly - like the joystick was engaged up or down - but it was not. 

Also, after pressing the Write button and going to patch 12 and then back, everything I entered was gone (i.e. leads me to think the memory is not working).