AppleTV 1st hard drive problem

Hi,

After a power loss, my AppleTV first generation doesn't work fine (3.0.2 software version).

It works fine when it streams from my macbook, but when I force sync from iTunes, when files are copying, it freezes the file copy. It seems that hard drive needs to be checked.

I try shutting down the AppleTV and pressing Menu+Down during Power Up, then I try to Run Diagnostics, but it replies with:

"there is a problem with your apple tv ethernet networking check the network settings" and the network is working fine, there is no problem with network. I try with ethernet cable and airport and both of them works fine, but Run Diagnostics always returns the same message...

How can I make a repair disk to check that all is working fine?

Thanks in advance,

Regards,