Mac Mini conflict with Western Digital External Drive

My Mac Mini used to work fine with my 2 TB Western Digital external drive, but now when I plug it in my desktop goes blank and the drive won't mount. I have tried it both USB and Firewire. The drive DOES work with my Powerbook G4.
Any help is greatly appreciated.
Thanks

Hi-
Please clarify.
What mini are you using? One of the new 2009 models?
As for the drive, is this a Firewire 800 drive or a Firewire 400 connection?
If it is a firewire connection, are you daisy chained to another firewire device? If so, in what order is the hard disk?
If it is a firewire 400 connection, what adaptor/cable are you using?
For a USB 2.0 connection, are you connected to a hub, or directly to the mini? Is the hub powered or not? Have you tried a different USB port? Same results?
Did you plug in both the USB and Firewire cables at the same time?
What is the model of your WD ext drive?
When you say that your desktop goes "blank" what exactly do you mean? The computer is still on, but there is no image on the screen?
You mention that the drive works with your Powerbook G4. By Firewire? USB?

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