1. It's not a good idea to remove the processor unless your replacing or upgrading your computer.
2. With a problem like this the culprit probably would have been the video card.
Try reseating the video card and making sure that the power cord is connected to it (if it needs one), and that your monitor is connected to it.
PS I seriously doubt it was the processor anyways, but since you removed it check and make sure all the pins are intact etc.
EDIT: I'm sorry I didn't read most of the current posts, good luck with the new processor...