Second display flickers off then on again randomly

I have a 20" iMac (early 2008), which I've had for about 9 weeks or so.
After a week or two, I got rid of my PC and connected my Dell 22" monitor via DVI to the imac as a second monitor.
However, it randomly 'cuts out' for a second or so, then comes back on as normal. It's only about a second long, if that (about the length of time you usually get when you change resolutions or inputs on a monitor).
The main imac screen never does it, and the external monitor never did it on the PC.
I've seen a few similar posts from other people mentioning it.
Any thoughts? Could it be a dodgy mini DVI converter? Dodgy iMac?

To help Apple narrow it down some, I used to have a GNR 19" Widescreen connected at 1440 * 900 and never had the problem, same Mini DVI adaptor. The problem started when I connected the 20" which works perfectly on a PC. I've tried dropping the resolution/colours but it makes no difference. Another forum on the problem:
http://forums.overclockers.co.uk/showthread.php?t=17933379
Help?

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