Hello i have lost all sound in COMBI & PROG IN MY X5D. WHAT SHOULD I DO TO GET IT..?

It's on this link-
How to Initialize reset and preload on the Korg X5 X5D DR SweetCare

Hold PROG and +10 while turning it on.

That should initialize the unit to factory fresh.

That sounds like a manufacture date being flashed. Have you checked the battery? If you can't backup first, all your changes (custom sounds) will be lost, but that might be what you are looking at. Replace the battery, or have a service center do so. You'll want to reset after.

Try ROM check first.

Initialization: Hold Page + and Page - while turning it on.
Preload: Global Screen 5A, then select "OK".
ROM Check: Hold Edit and Global/Multi while turning it on.

Guide:
How to Initialize reset and preload on the Korg X5 X5D DR SweetCare

Korg X5DR X5D Soundbanks

Hi,
if you do not already use a midi sequencing software try "Bome's SendFX". After installing, go to X5D menu 04A MIDI DUMP, choose data you want do dump (e.g. "all"). Make sure, that no SYSEX FIlter is active while working with a sequencing software.
After transmission, you can save the "yoursounds.mid" file and send it back to the X5D later.
Good luck!

Just go to COMBI mode.



Press PAGE+. The display may look like this :
or

In the example above, A03 and A49 is a sound PROGRAM number.
OFF and OFF is a Layer 3 and 4, were not activated.
So in our example, we only activate two voices (two layers).
X5D can combine up to 8 voice. To view the Layer 5-8, press PAGE +.
To change the sound of your choice, move the cursor to the corresponding layer, use this button:


then change the value with the slider / value key (YES and NO):

You can also set the level of each layer.
Press PAGE + until a menu appears LEVEL.
Move the cursor and sets its value

You can try this.
STEP 1:
Set Program protect and Combi Protect to OFF.
- GLOBAL
- Using PAGE+ or PAGE-,
find untill the display show "3A-MEMORY PROTECT".
Set the parameter to OFF by using YES or NO button.
STEP 2:
Data Load.
- GLOBAL.
- Using PAGE+ or PAGE-,
find untill the display show "05A-PRESET DATA".
Change ALL to PRG (your case).
Use Left/Right Arrow button to moving cursor.
Choose "PRE-a" (your case).
Move cursor to "OK?".
Press YES when "OK" blinking for confirm.
Exit (Go to PROG button).

There's a watch type battery (flat disc) on one of the boards inside the X5D. This maintains the settings while the keyboard is switched off and could be the whole problem.
The keys are on two different circuit boards connected with a multi-pin cable. If the cable were dislodged I would expect it to simply cut off half the keys but it's probably worth checking.

For Combi/Multi patches you can disable control changes for each sound under EDIT 6D but this also switches off other control change instructions (pan, expression, pedal etc.).

Somewhere under GLOBAL settings you should be able to find the modulation wheel Depth setting and set it to 0 which should stop your mod wheel from working but you could achieve the same effect by just keeping the mod wheel pulled all the way down.

Download the owners manual from here and try doing a reset to factory settings
http://www.korguksupport.co.uk/page.cfm?pageid=391#Owners Manuals