I5 27" imac display doesn't turn on

Hi,
This issue just cropped up for me this morning. When I go to turn on my recently purchased (Feb 2011) core i5 27" iMac, the screen doesn't turn on. Instead, it remains black until I hit the power button again, after which it will usually come to life. It sometimes goes black again without any warning. I can usually get the screen to come back to life if I hit the power button. However, I have an older 24" cinema display hooked up as a second monitor, and it always comes to life when I start up, and never goes black like the iMac display. Anyone else having this problem? Are there any known/recommended solutions?
Thanks!

Reset the SMC > Intel-based Macs: Resetting the System Management Controller (SMC)
and zap the PRAM > Resetting your Mac's PRAM and NVRAM
Then if that doesn't help, contact Apple Support or your Local Apple Service Provider. > Apple - Support - iMac - Service FAQ
Dennis

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