Problem with screen going suddenly blurry and no controls working

Allo everyone,
I bought a brand new iMac a few months ago and twice I've had the problem of the computer freezing with the screen going completely blurry and none of the controls working. No mouse clicks, no keyboard taps, nothing.
The last time it happened is tonight, and I had Firefox, Safari and Quicktime running at the same time. I can't remember what I had open the first time, I think it was just Firefox.
Nothing short of hitting the power button and switching off the computer can solve the problem. After rebooting it works perfectly.
It's got me a little worried as my partner and I work on some quite major projects, and I'd hate to think it's going to do that in the middle of our work.
Is this a software or possible hardware malfunction? Or am I doing something wrong here?
Many thanks in advance.

Definitely take it back, quickly. Most likely, by symptoms, you have a failing motherboard. Seems to be an issue with HP with many of their models. If your warranty expires your goose is cooked. I'd recommend you show the repair facility the actual symptoms before you leave the store, and get them to write up the problem accurately at time of drop off and get a copy. Get a paper trail. If you ship it in include a detailed description and keep a copy.

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