Mac won´t start after sudden crash

hi,
my macbook pro suddenly quit working. When it tried to restart itself I got a gray screen with a file map on it.
Could anybody tell me what the problem is?
thanks!

Joris,
if it's a folder with a question mark on it it means that a boot drive cannot be found. See if you can boot into your Recovery partition – hold down the command and R keys whilst booting and see if you can get into recovery mode. If you can open Disk Utility, select your boot drive (usually named "Macintosh HD" uness you've changed it) and click on the "Verify" button. If you get a message that the drive needs to be repaired, click on the "Repair" button. With any luck, the disk will be repaired.
Call back after you've made this attempt.
Clinton

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