Can not access my data!

I have a 6tb Duo drive i set up 1 month ago.  It was working fine and now I have a solid yellow light and I can hear the drive making noise.  I can not access the server via the web nor the set up disk.  I tried connecting directly to the computer but no luck.  I have 4tb worth of data on it.  Any Ideas?  I use a mac and my router is an airport extreme.

Thanks for your help…

Hi, the my book might be stuck loading the OS. What type of RAID are you using? If you are using a RAID 1 configuration you might be able to recover your data by connecting the hard drive directly to a computer running Linux.