M-Audio Fast Track Ultra 8r HELP!!

Hello

I am in desperate need of assistance.... I have been using M-Audio Fast Track Ultra 8r for some months and it has worked perfectly... only today (just when I needed it most) it stopped working when I plugged it in as usual.

It makes a popping sound and the green and red LEDs along the front panel flash respectively and it will not be found by Logic 9... or anything else for that matter.

I am running MAC OSX 10.6.6 on a Macbook pro
2.53 GHz Intel Core Duo
4GB

I remember this did actually happen once before but I simply put the original CD in and re loaded the driver from there and it seemed to work... only, that CD fell foul to a toddler and is basically knackered...

The latest drivers don't seem to be working and I have done everything I can find on here to try and solve it including...

- Downloading lastest drivers
- Different leads and ports
- Downloading latest update combos for snow leopard from apple site, and repairing disc permission in utilities
- Rebooting holding cmd-alt-P-R which apparently has something to do with resetting RAM

I am not much of a techie... I just like things to work!

Any help gratefully received... I can't afford a new interface and I have lots of work to do

Many thanks
T