Overall, try putting the screen back into the one with a bad hard drive, and replace it with the other. The thing is you will need a full version of Windows UNLESS it's the same exact model or you have the recovery CD's.
Far as the video card goes, the only way to replace the video card is to swap out the motherboards. At that point, you're pretty much looking at a new laptop. Considering the model, in the long run, better off just replacing it out right now if neither still work.
Yes they are the same exact model and I do have the recovery cds