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E4300 DisplayPort not working

I have a Latitude e4300 with docking station, and I'm trying to drive an external monitor with the DisplayPort cable.  Windows won't detect the monitor.  Monitor keeps entering save mode.  If i switch to use a DVI cable from the docking station to the same monitor it works. 

Win 7x64 Enterprise, Mobile Intel 4 Series Express Chipset Family, Intel driver version (latest available from Intel). Monitor is Dell 2408WFP

Any thoughts?

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