I have an IMB Thinkpad A31 Recently I have experienced some problem with the screen. It becomes dark no picute or it it comes up it will be shaking. I run a test and sometimes the video will fail the test. I think I need to buy a new video card but I do not know where to get it. Somebody suggested that I vist lenova.com but I did not see a link to parts Any person with an idea please? The video type is IBM Thinkpad and 16MB ATI Mobility RADEON 7500 NB is there any upgrade like 32MB intead of 16MB and will it work with my computer?