New aluminum iMac 24" - texture problems

[Buckie]

I'm also having major problems with textures on a 24" iMac (aluminum). I'm in section C, trying to find the keypad to unlock the door. The lower 3/4rds of the room is all tan/grey. I've turned the shaders, etc., off, with no positive effect.

Aside from a fix to the game, can anyone tell me where the keypad is? Is it left, right, etc., of the security door? A description & screen shot showing the position of the keypad relative to the security door might do the trick.

Thanks!

It's a bit off to the left. Look around and you will eventually stumble upon it.
You will probably have to wait for the patch to finish the game anyway because a bit further into the mine there's a place where you have to jump around and you don't see anything. I managed to get across the chasm after a hundred falls but getting back is next to impossible.