Os system not loaded! hard drive was totally formated. PA800

I suggest a hard reboot / initialize. Istructions are in your manual or on the Korg website

I wouldn't recommend doing that, because your OS system could freeze occasionally

If you are being asked to reload the OS, you will have to do that. SOME devices have trouble with USB sticks that are larger than some limit... that may or may not be specified. If you haven't tried reloading, try it with a USB stick no greater than 1GB... yes they are getting hard to find that small.

One of the internal data for one touch has become corrupted. The best thing is to do a factory reset. Read your manual and follw the directions for a factory reset.

Find information of the procedure here:

http://korg-roland-synth-videos.blogspot.com/2009/07/pa800-system-data.html

1. turn your keyboard on
2.hold the intro 1, by turning it on

REad this site:

http://www.korgpa.com/pa_root/en/products/pa800_soft.html

ESPECIALLY the mandatory reload of resources after the updated OS.

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]

Korg Pa800 Synthesizer i have noise on ram samples Answer i turned on my pa800 and when i play ram samples there was some noise like cracking and distortion,... (More) i turned on my pa800 and when i play ram samples there was some noise like cracking and distortion, that happened 2 or 3 times, now its normal, but i think it may hapen again??? where is the problem, somebody says it is on motherboard? or its just ram overheating? since i install 2.01 os i noticed that its kinda warm in right display corner, can u help me???

It seems as though it may just be a sample issue.I have had this similar problem before,because each drum hit corresponds to a key on the piano.It could also be the program you are using to open it.

you have memory problem it cost $150 to fix it