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new monitor U2715H, old system XPS 420

Hi all - thanks for any help with this:

just bought a new dell monitor U2715H in hopes of adding a second screen to my current system (pretty old XPS 420) Monitor out is DP,  video card in is DVI x2 - old monitor has the first DVI slot - got a DP and to DVI cable and hooked it up, but new monitor not detected anywhere - driver updates of the video card are crashing.

Dell support is not helping despite much trying. do I need a new video card (Radeon HD1600XT) or am I missing something? I realize I'm due for a whole new system but am in the middle of a deadline for a project

thanks for any help!

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