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Diane,
Your bulb socket has probably burned out. As far as being cost effective, that would depend on whether you could find a new socket and how much someone would charge to put it in if you were not wanting to try yourself.
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Like many overhead projectors, the Buhl 2900 can accept TWO projector bulbs (the operating one plus a spare). Make sure you inserted your replacement bulb in the slot for the operating lamp. There is a slide lever on the front of the unit that allows you to quickly switch to the spare lamp. Turn off the projector and move the slider to switch to the other bulb slot. See if that does the trick. Good luck!
Overhead projector consist a large box with a very bright lamp and a fan to cool it. On top of the box is a large fresnel lens that collimates the light. Above the box is a mirror and lens that focusses and redirects the light forward instead of up.
An overhead projector is a very basic but reliable form of projector. The overhead projector displays images onto a screen or wall. It consists of a large box containing cooling fan and an extremely bright light, with a long arm extended above it. At the end of the arm is a mirror that catches and redirects the light towards the screen. An overhead projector can be used to enlarge images onto the screen or wall for audiences to view.
It sounds as though the unit is overheating. That would explain why the fan keeps running, and once it cools down enough it starts up again. What kind of environment are you running this in? Is there a way to put it in a cooler environment? Even having an external fan blowing on the unit could help.
Honestly, unless you've got it in a very hot environment, it also sounds like a poor design for heat dissipation. Or possibly the heat sensor is bad, and shutting it down at a lower temperature than it should.
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