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My Dell e6400 no longer can extend desktop. The external monitor detected and I can changed the resolution in display properties. But the external monitor reported on a power save mode. To confirm this, I unplugged the cable and the external monitor shown 'no signal detected' message.

Tried with many cables and monitors/projectors.

EDIT: Yes, i did enabled second display. I did this using Windows Mobility Center.

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Did you enable extending desktop to the second display? – May 7 '12 at 11:21
Please specify the Os you're on and tag your question accordingly. – Bram May 7 '12 at 11:58

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