Mac OS boots but is not visible

Hi,
I have the following problem:
From one moment of the other my screen froze and and I had to restart the MacPro (SnowLeopard). Since then I couldn't get back in the system. The problem is, it stops at the screen with the apple and the loading circle.
At first I thought there is something wrong with the system hard disk, but the "funny" thing is, that although the screen freezes while loading, the system completely loads - but I cannot see it. I only recognized it, because I saw the macpro in the network and I also can plug in my iphone and it starts syncing - but I still only see the apple screen.
btw: I wanted to try the disk tool from the install dvd - but I couldn't load the program. the mac always brings an error while the grey screen + apple and that I have to restart... I tried the same via USB - but it also doesn't work.
when I bring it in target mode - I have access to all hard disks - except the system disk.
Has anyone an idea what I could do?
Could it be something with the graphics?
Thank u!!

You should be able to do either or both of these:
• Boot with the Shift key held down. This runs a disk check and then brings up the system in Safe Mode, with minimal extensions loaded.
• Boot from the Installer DVD, but do not install:
Hold down Option as you start up.
Wait for the screen to draw.
Press the Eject key to open the DVD tray.
Insert the Installer DVD and wait for it to be seen.
Select the Installer DVD and proceed.
Answer "what language" and wait for the MenuBar to be drawn.
Choose Disk Utility from the Utilities menu.
Select your boot drive and click ( Repair ).

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