Just some basic questions.
1.) Was the drive initially set up ? Did it ever turn on ? You did have the FAT32 partition already setup and running before?
2.) Did you use Smartware or Windows to install it.
3.) Is the My Book plugged in directly to a wall socket or a power strip ? If its plugged into a power strip, try the wall socket directly.
4.) Are you using the power switch on the back of the unit or unplugging the power cord to turn off and on ?
5.) Are you using the original 18 watt power supply ?
7.) Have you had any power surges or outtages in your home lately ?
6.) Have you checked your USB cables and Ports and Hub Controllers in Device Manager ?
If you cannot get any power to the unit after double checking the things above your power supply may be shot. You can order a replacement for your model here… My Book Essential Parts
You also need to rule out the USB cable , it could be bad too.