Computer wont start after new video card?

my video card caught on fire after the fan stoped working, but that was the only thing that was damaged. I bought a new Geforce 8400 and plugged it in my computer and turned it on. Now all it does is windows starts up , i sign in and then it turns to black and says the graphic card name on the screen and thats it i dont know what to do im not good with computers so ill need a simplified expliantion if you have one thanks! :)|||video card caught on fire ,and no other damage,what about the time it took you to get in there and get it out,i think they will be more damage if it caught fire.|||Did you install the driver? The manufacturer of the video card, in this case Nvidia, will have the driver posted online. There is even a utility that automatically detects what driver you need. Once installed, it might help you. However, I fear the fire may have damaged the pins in the receptacle slot, which could also cause trouble.|||If your video card caught fire it probably damaged other parts of the motherboard. You will need to replace the motherboard and maybe the memory as well. Make sure you get a motherboard with the correct socket for your microprocessor.