The port wont matter.
Ont thing that you may run into is at boot. You may not see the boot screen.
If that is the case then turn the computer off and then switch ports and all will be fine.
Make sure whatever video card you buy comes with a DVI to VGA adapter. Most new cards do. It turns the DVI port into VGA and you should have no problems.
------------------------------Big Brother Rules with an Iron Fist
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