New imac displays horizontal grey bars and green pixels on startup and then freezes on a light grey screen

This is happening on a brand new 21 inch imac, all new specs released a few days ago.
This happened the first time I started up the imac straight out of the box. The screen displays alternating light and dark grey bars with green pixel specs all over it. The apple symbol and and loading symbol are visible too - but it then goes to a light grey screen and freezes.
If I manualy restart it will then startup normaly but will do this next time I startup the machine from a cold start.
Does anyone else have this issue. This is my first mac and it doesn't seem acceptable to me. I think I've been sent a dud!
Any help / opinions would be helpful. Cheers

I wouldn't try to solve this issue by troubleshooting a brand new machine. My personal policy is if an electronic device is malfunctioning out of the box, I return it for a replacement. We're talking about an expensive purchase and it should work, but even with stringent quality control a small number of products will fail out of the box. You didn't mention whether you ordered it online or purchased it at an Apple store. If you can, get a new machine at an Apple store and take advantage of the free setup. An Apple salesperson will start it in the store, so you'll know before leaving if it's good.

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