Re-install OS for the Akai S900

Hi people!

Do anyone now where or how I can get the Os on the S900 Re-installed?
The sampler broke down because of some electrical failure, but I've sent it for repairment and now everything is fine except for the Operation system witch I need to reinstall.

CAN ANYONE PLEASE HELP?!?

i seem to remember mine didnt boot up properly after i replaced the disk drive , i flipped the cable over and everything loaded up fine from then on. Shouldnt the repair guys of checked that it was working ok before they sent it back?