I don't think the data is lost. Probably the worst case scenario would be that you have to disassemble the device, take the hard drive out and hook it up to an IDE port. It's just a normal 2.5" laptop drive. You can find 3.5" to 2.5" adaptors or you can put it in a laptop.
As for the FM recorder, is it *totally* dead? Is there any slight flash of the on LED, sound from the device or sound in the headphones when you try to turn it on? If there is, the battery is probably deeply discharged. The charger doesn't provide sufficient power to start up the hard drive, and so the device cannot turn on without some battery power. I got around this myself by taking the battery out and charging it a bit. If the device really appears totally dead even when USB or the power adaptor is plugged in, then I suspect some fault on the circuit board.