well never see that screen,did you try to boot from the mac os dvd and try to repair mac hd
if you can't boot from dvd too, your mac is toast i need professional help
Did you follow the steps described on the official support page I linked to? The question mark can appear for various reasons such as system software corruption and mechanical hard drive failure. If it's due to data corruption, you may be able to fix it by following the instruction. But if your HDD has gone for good, it basically means your drive is "screwed," and replacing your HDD is pretty much the only option.