Screen still black. Help please.

Hi there. I bought an iMac yesterday, but after a few hours playing around with it, the screen went black like it was going to sleep. I tried waking it up, but nothing happened. I unplugged it and tried restarting it, but the startup sound played and the screen was still black. After about an hour, it went back to normal, but then five minutes later, BAM. It happened again. I went to bed and left it, and when I woke up, it seemed fine. But after ten minutes, it's gone again. It seems to happen whenever I'm on YouTube or playing videos in Quicktime, so is there a way to prevent this crashing in the future?

If you purchased it directly from Apple take it back to the Apple Store you purchased it from. If you purchased it from another retailer return it for exchange from them. Otherwise you will need to contact AppleCare (number is in your owners manual), obviously this should not be occurring on a new machine. AppleCare is open M-Saturday during normal business hours.

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