Backup via Time Machine Failed

wow I only setup my new Western Digital My Book Studio 500GB HDD last Saturday and now I have a failed backup I got a pop up message saying Time Machine unable to do backup or something, so went into Preferences/Time Machine/Latest Backup Failed.
Info: Sn error occured while copying files to the backup volume gahhh
What do I do?

Using Firewire too.

Thanks

EDIT: Did a google search as well and read a thread on Apple Discussions, and wow there are a lot of people with Time Machine failing to backup after the first backup Lot's of sugguestions but I wanted something simple to try before I go do anything big.
I found this: click on TM in the dock. There is an option "back up now". this is what I did and my backup worked!!

Solved for now

Have you upgraded to 10.5.3 yet? There's quite a few bug fixes in that release. I'd give it a shot and see if it makes a difference.

I noticed that 10.5.3 really does help with time machine, especially with time capsule. When I had a USB HD as my time machine I never had any issues, but time capsule gave me a lot of grief (errors mounting the disk and such). So far with 10.5.3 it seems to be going smoothly, I hope it stays that way.

Yep I did the update a few days ago, but my problem is solved now

Thanks

When my Time Machine on the iMac gave a failed backup, I found the firewire cable had vibrated slightly loose halfway through the process, I check it every time now before doing it.

Cheers

Hugh

ps the other strange thing is that it won't back up when my wife's sewing machine is working - interference ? ? weird