I have a 2010 MBP. I have been running on dual external monitors with no problem. Today, when I unplugged the monitors (still hot) my laptop monitor froze with a solid screen of multi-colors. Reboot, reset pram does not work. Here's what I found: Output works fine to monitors. Everything works in Bootcamp. When I turn on automatic graphics switching in OSX the computer screen freezes (this is switching to the integrated intel vid card). Everything works fine with the discreet graphics card. So, I thought the integrated graphics was fried. Apple store genius agreed and wants to ship my MBP for new logic board. BUT: I pulled my hard drive out and put the original hard drive in to ship and THE PROBLEM CAN'T BE DUPLICATED NOW. This leads me to believe that it's not a hardware problem. I put my regular hard drive back in and same problem. Can't run on the integrated vid card. Tried again with the factory hard drive. NO PROBLEMS. Can anyone give me some insight as to how to fix this? I am completely stumped. Can the video card be "reinstalled"? I really need this fixed!!!!