Help! Stuck on white screen after sleep mode and won't start again!

Bought the iMac last week, updated to 10.5.1. Worked well until this morning after I did a security update. Then put it in sleep mode - and basta! After I wanted to work on it again - it didn't restart. So, I had to switch off using power button, but it never started again and always got stuck on the white screen with the Apple logo and the rotating loop. Tried to repair permissions - cannot do it, as it says there is an error. Tried to re-install from DVD the Leopard while archiving the previous information - can't do either - says error. Now trying to re-install it again with an erase option. But this is not a good option, people! This is pretty very much disappointing, Apple!
Can anyone help, please!

Boy that is way too bad.
Could you tell us what the error message was?
While sometimes the error messages are not very informative, other times they are. That might be a clue as to what is going on.
When you restart from the DVD you have the option to access Apple's Disk Utility and repair the disk.
You might want to try that, skip repairing permissions at this point.
You can also reset the computer by unplugging all cables including the power cable for at least 15 seconds and then plug in the power cable and keyboard and restart.
You can reset the PRAM by holding down the command-option - p - r keys simultaneously during restart and waiting for the startup chime then releasing those keys after the second chime to allow the start to continue.
HTH

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