Game won't work - Mac

Hi guys

Recently changed computers from a MacBook to iMac.

I copied my SteamApps folder and transferred it to new machine. Then I downloaded Steam, logged in and moved FM and all of its docs to my new SteamApps folder.

When I try to play FM the game bounces in the dock momentarily before disapearing. I get no error message.

I have tried re-installing Steam, downloading FM from scratch etc etc but nothing works.

Anybody had any similar problems? Steam's support is being a bit slow and I would kind of like to be able to play the game I've paid for and been playing for 14 years!! Kinda wish I'd bought the disc as normal now!!!

Thanks