Monitor turns off when power is disconnected

Hi,
I have just recently purchased a new 15" Intel Macbook Pro.
I seem to be having problems with having an LCD monitor connected to it, and then pulling the power to the macbook.
The LCD monitor (Dell 22") turns off and I have to reboot the mac for it to come back onto the Dell.
Is this a known issue ? or is there a battery saving setting that turns off the DVI port or something ?
Any ideas would be appreciated.
Thanks in advance.
Phill

Thanks for the reply David.
It could be, we do have a few of them here, all of which are using the same dells, and I think they all have the same issue.
When running on power initially, it works fine, then if power is pulled, 22" LCD goes blank (power saving mode) - and you can then only use the Macbook screen.
However, when you lift the macbook lid and the desktop appears - the 22" Dell resumes - but as a secondary screen.
Very odd...

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Message was edited by: spudnuty
Message was edited by: spudnuty

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Monitor turns off when power is disconnected

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