Hi Leslie,
When you say you forgot to unplug it, do you mean from the electrical socket? That wouldn’t make a difference, unplugging the projector is more of a precaution so it doesn’t accidentally get turned while the lamp is being replaced. Turning the projector on with no lamp can damage the color week. Another possibility is that you did everything correct during the installation but the new lamp is a counterfeit that hasn’t been calibrated for the projector. Is it an OEM authentic lamp? If not, it doesn’t matter how many times you re-install the lamp. Also, the old bulb is not going to work either since it’s reached end of life and the projector will register and not turn on to protect itself. Final thing was did you reset the lamp timer after changing the lamp. Many people forget to this last key part of changing the lamp and as a result the projector thinks it’s still got a lamp out of time. I would recommend checking out our forum as well for similar problems and joining for more expert help than what I am able to give. http://www.fixyourdlp.com/forum/
Regards,
Shelagh