24" iMac backlight problem

I've had my 24" imac for about 6 months. This morning when I switched it on the lower half of the backlight has not switched on (so the screen is dim at the bottom, and bright at the top).
If I put the computer to 'sleep', when I wake it, the bottom half of the backlight flashes on to normal brightness for about 3 seconds then switches off again.
..I'm assuming this can only be a hardware issue?!

Sounds like a hardware problem. However, you can try this procedure to reset the SMC (which controls power management in the iMac)
http://docs.info.apple.com/article.html?artnum=303446
If it's only six-months old, it's still covered by warranty. If there's an Apple Store nearby, take it in. You can make a reservation for the Genius Bar at
http://www.apple.com/retail/

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