When computer is booted up nothing appears on the screen except a message saying No Video Input. Emachine was fine when it was turned off an hour ago. I'm trying to determine which video card to get for a replacement and have had no luck finding out which card to get. The stats tell me the card is a NVIDIA GeForce 6100 GPU but when I go to the GeForce web-site I can't tell which of the GeForce cards is for this machine. I'm not very computer literate and need help! Thanks.