Mini-DVI out problem

I recieved my mini-dvi -> dvi apple adaptor from ebay this morning (finally!), but am having a feew teething problems. The plug fits snugly in the back of the iMac, but if pressure( only a little) is applied to the side or top of the plug (the one going into the back of the iMac), I lose the picture. Is it possible that I have a dodgy knock off adaptor ? The part number (603-3795) on the wrapper matched the part number for the 12" powerbook G4 mini-dvi -> dvi adaptor.
After a little more examination I have found that if the plug is pushed in fully, it does take a little leverage to make the connection 'die' I suspect this is due to the greater number of (very) small connections on the mini-dvi port. It does only seem to happen when the plug is pushed toward the DVD drive side of the iMac too (again suspecting losing the connection to a key pin or two).
Does anyone else have experience with this ,and can they advise if they experience similar problems?
Of particlar note is the fact that the menubar (which I have placed on the external monitor) does not get relocated to the iMac screen when the external monitor goes dark, so presumablyy the mac still thinks the monitor is connected. Is there any chance the problem is due to a faulty connection on the motherboard.
I only purchased the iMac from John Lewis last Weds, so presumably I would be within my rights to return it and insist on a replacement?
Grrr, just want it to work right
Thanks all

the cable was broken - new one from apple fixed it

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