ethernet ports attached it doesnt light up like it used to inside the case so could it be the cuirtboard that is gone and just wont respond ?
Could be. I'm not familiar with WDs MyBook line, and it looks like there are quite a few different configurations.
I'm hoping you realize that any tampering with the unit will void the warranty, but, if you send it back for repair, all your data will be gone anyway.
If I were you, I'd be removing the drive from the case, and hook it directly to your MB. This would eliminate the possibility of a faulty USB/Firewire/eSATA interface. If the drive still isn't working, try GetDataBack.
Good Luck!
Edit.... I just wanted to clarify, ALL these troubleshooting ideas only apply to a drive that is working mechanically. If the platters arent spinning, the head is sticking, or it's making horrendous noises (the drive, not YOU), none of this stuff will work. If that's the case, sometimes the freezer trick will work, but if you're planning professional recovery, I wouldn't try it. You have a big chance of making it worse!