Unable to install mountain lion on iMac

Hello
I bought mountain lion and installed it with no problems on my macbook pro. After that i wanted to install it on my iMac(intel) too, but here i fail repeatedly.
Mountain Lion gets downloaded, installation dialog appears, everything seems normal except for duration: Once the installation starts it says "Remaining time 3 minutes" and thats it, after three minutes the whole process ends, no reboot, no error message, no nothing.
On my MBPro it took about 50 minutes (estimated 30 minutes and then another 20 minutes) - but the installation succeeded.
On my iMac it says from the beginning that it will take only 3 minutes.
I disabled time maschine, no user except admin user is logged in.
What can i do?
iMac was bought about last summer, i am within my 1 year warranty - so my iMac should not be too old.
Regards

Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at the top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If 10.7 or more, reboot holding CMD+r down to boot from the Restore Partition, use Disk Utility there to repair the Disk, reinstall may be needed if errors were found.

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