How do you know if your turbo's given up the ghost?

On my way home this evening i noticed my boost gauge wasn't moving, this then drew my attention to the fact the car had no power when i put my foot down. I've checked that none of the hoses have come off, but that's about as far as i go when it comes to under the bonnet.
Can anyone give me some suggestions on what else to look for before i make the trip to Ford!

Thanks in advance

James