IMacs won't start after restore

I have a lab of 40 iMacs with different accounts and permissions for each class I teach. At the end of each term I restore all the Macs from one Mac that I keep clean and updated just the way I want it. This way I can start clean. The process has worked well until this term. With the new upgrade, I have a few computers that won't restart after a restore. I've tried again and they seem to be restored using disk restore, but stall out on a screen with an Apple. I get no clock like spin. A few have worked the second time.
I've checked the drive with disk utility on the CD/DVD and there seems to be no disk problem. Running permissions of the cd/dvd just hangs up.
Any help will be appreciated.

The Finder won't tell you the status of the clock batteries unless they are completely drained. Partially drained batteries can cause misbehavior like this. You have to open the computer up and remove the clock battery and test it with a battery tester to see they aren't partially drained.

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