Moble GPU replacement

[JDMather]

Recently I began getting a series of repeating yellow bars in approximately 25mm squares across my screen. If I srcoll in a window the bars smear the display. I reformatted the hard drive and reinstalled all drivers with no change.
The system is a 17" notebook purchased from www.pro-star.com
P4 3.6 GHz
2G RAM
nVidia Geforce Go 6800
This looks like my graphics card http://www.extremetech.com/image_popup/0,1694,iid=98927,00.asp

I would like to order a replacement graphics card but after searching all morning I am not sure what to get or from where to get it. I cannot seem to find a source for the exact replacement. (I would rather not deal with Pro -Star as my experience with them has not been good. The computer is out of warranty.) I pulled the card and put it back so I am not concerned that I can do the replacement if I can just find out where to buy one. (Would the local Circuit City or Best Buy sell these cards? Seems like everyone I talk to just wants to sell me a new computer.)
Actually I do a lot of CAD (Inventor, SolidWorks, Pro-e) would like to replace with a card certified for these applications if I can find one for a notebook.
I am not sure how to get something that will work with my machine and where to get it from.
JD

 

[defaultluser]

If your 6800 Go uses the MXM slot, it should be replaceable. If it does not use MXM, you're screwed.

Unfortunately, the laptop makers have the MXM market cornered, so you can't easily buy MXM modules. Also, since there's no marketplace, the prices are high.

See here for details. They have a store with limited selection, but you won't like the prices. They have a 6800 available for 300 Euro.