My Book Essential Edition won't boot without power cycle

I had these two My Book’s connected to my desktop with Windows XP SP3 and they worked fine.

The desktop died so I am now using my laptop with Windows XP SP3 in it’s place.

First I will try this drive on my wife’s machine to see how it works before I reformat the drive.

I am using the My Book Essential drive as a backup for the My Book Office drive. When I initailly set this up it took almost 2 whole days for the WD Anywhere Backup program to copy everything from the My Book Office drive (500 GB) to the My Book Essential drive (500 GB). I don’t want to have to do that again if I can help it.

Thanks