My 3M 1800 series overhead power button won't stay in the
Problem: When you press the blue or red power button on
your 3M 1800 series overhead projector, the lamp and fan come
on for an instant but then go back off when the button is released.
The power will stay on if you hold the button down.
Solution: Send your projector to an authorized 3M service
center, like United Visual, and get a free update to correct this
problem. Note that the service center will determine if your particular
problem is covered by this warranty update, but this series has
a known problem with the power button and related parts.