Out of the blue, the game wont load. The GC3 splash screen shows for 1-2 seconds then disappears. Then nothing happens.
It was working fine a few days ago. And was working fine on my desktop last evening.
I've been through the relevant items of your Troubleshooting page. I've deleted the game from steam and renamed the GC3 folders. Then reinstalled. No change.
All my other steam games are working fine on this machine. Nothing to my knowledge has changed to this machine.
I've submitted a support ticket.