This is just about the worst place to post this, so:
Do I have to restart the whole game?? There are a thousand threads about this widespread… “no target locked” no matter what, with psycho yelling “use the cannon!”. Yes i am pointing it at the green thingy and the shields are down and ive taken out the turrets and I’ve milked the cow in the armoury and punched the secret spot on the wall… Is there a fix? Patch does nuthing!!! The fact that this is basically the end of the game really pisses me off. (If you have no idea what any of this means, ignore this thread).
Solution: Put down Crysis, buy L4D.
Success!
Second, I just downloaded L4D yesterday. It’s a great game, far better then Crysis. I’m probably going to buy this game so I can play with friends and stuff. That would be cool.
lol same thing happens to me, I never beat the single player I usually only play PC games MP =)
Lol that happened to me as well, reastarting only the level is what fixed it for me.
(spoiler:
Don’t expect much of a big ending but, all he does is fly away and you get a lame cliffhanger 
Left for dead, eh? I’ll see…