Won't Start... any ideas?

hi people,
just got the new education imac and on starting worked fine, but turning on for second use, won't start up. i see the white light, the powerup sound but black screen and nothing thereafter. any ideas?

Firstly, try holding down X at startup. This will force your iMac to boot into OS X. Failing that, try putting your install DVD in the drive and holding down C at startup. This will force your iMac to boot from your install DVD. You can then try repairing the disk from there (or if necessary reinstalling OS X).
If neither of these work, then I'd say Apple would be the best people to deal with your problem. Maybe you should just call them anyway? This is unacceptable in a completely new computer.

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