Hello ! To be honest I have never had the need to use a External Grafics card, so I have no real experiences to share with you. IMHO the mother board would be the way to go; if you're good at putting things together. Lap tops are pretty delicate to work on. I was looking for the easiest way. You would want to make sure it's the grafics card causing the trouble. I use a HDMI cable to connect my Toshiba laptop to my flate screen TV. It works verey well. Just make sure the sourse is correct.
Here's a vedio that covers all the ways! You might get more advise from others also!
http://www.youtube.c...h?v=WDQCXOSJGM0