Connect second monitor

Welcome to the forums :emotion-21:

I have an Inspiron E1705. Want to connect a 30" monitor to use at the same time as the standard laptop screen.  What kind of video card or dual monitor adaptor do I need?

Unless the E1705 is one of the few laptops with upgradeable graphics cards, you can't do anything about the graphics card in it :emotion-55:

If you want to use both screens at the same time, you're probably going to need something like the Matrox DualHead2Go?

That will depend on the monitor you buy and what its requirements are - no one can answer without knowing.  It probably needs a dual link DVI cable, so your notebook should be all set.