Como resetear korg.. - Korg Pa50 Professional Arranger Keyboard with SD Card Slot

Sounds like loss of memory\programming.Go to Korg website for download.

https://www.korg.com/tmp/support/download/index.php/manual/0/90/1945/?country=us&page=manual&prodtype=0&prodid=90&fileid=1945

https://korg-pa-paradise.blogspot.com/2018/04/blog-post.html

https://www.manualslib.com/manual/1060488/Korg-Pa60.html

Your best answer would come from Korg. Itself. Here's the link-
http://www.korg.com/us/support/contact

If you have electronic expeerience, take it to a repair shop. You can cause more damage okiong around if you don't know what you're doing.
Past that, contact Korg customer service for the schematic and parts list. The part should be available from Korg directly of from Mouser
http://www.korg.com/us/support/contact
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Carlos Hi
despues de formatear el equipo todo tiene que volver como recibistes el pa 500 nuevo de fabrica

ola claudio
tienes que resetear el organo y despues cargar el os

Here's some links.https://www.google.com/search?q=korg+keyboard&aq=f&oq=korg+keyboard&sugexp=chrome,mod=0&sourceid=chrome&ie=UTF-8#hl=en&tbo=d&sclient=psy-ab&q=replacement+keys+korg+keyboard&oq=korg+keyboard+keys+replace+ment&gs_l=serp.1.0.0i8i13i30.43550.56800.0.59049.18.18.0.0.0.0.165.1688.14j4.18.0.les%3Bcesh..0.0...1.1.geeNjdPgveM&pbx=1&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.&fp=142cd5af7754d791&bpcl=35466521&biw=1066&bih=532

From the original site of korg (http://www.korg.com/Support) there is nowhere the model u r describing.Please make sure u have posted the correct model description.

i would send it out to the manufactures just to be in the safe side

The pa800 has a fixed amount of Ram at 64mbs and it is not physically possible to upgrade the Ram. The pa2x has a removable128mbs Module and that can be upgraded via a 256mb Module from Korg.
Keith [mrniceneasy - KorgForums]