INFOCUS LP250 dead after summer nap. Ceiling mounted in school classroom. Unit worked @ end of school, May 08. Dead as a door nail now.Aug 08. Silent, new lamp no help. Teacher will have my head on a pike if not ready for start-of-school. HELP!

http://www.ebay.com/itm/InFocus-LP240-LP250-DP2000x-projector-POWER-SUPPLY-CD-/220720929521?rmvSB=true

First suggestion is checking to make sure that the tray/chains are secure - that it's not going to fail at at a point of connection either at the ceiling or point where the chains fasten to the tray. The tray must be strong enough for the weight of the projector (most InFocus classroom projectors are not that bulky and heavy).
Hanging anything with weight from the suspension ceiling braces is not recommended. If possible, having the wire/chain continue thru the ceiling panel (a small inconspicuous hole can be made through the panel) up to actual ceiling joists or whatever material the ceiling system itself is fastened to is best & the most secure. I've used steel aircraft cable (available at any Home Depot or hardware store) in place of chain, partly because it only requires a small pencil-sized hole thru the ceiling panel, hardly noticeable.

Most hanging fixtures (theatrical lights, projectors, etc.) have a secondary/backup safety cable or strap system should the main fasteners fail. In this case, if the tray and ceiling connection is secure, a safety strap holding the projector onto the tray so it's not sitting up there loose or able to be knocked out at all should be used. This also will help keep the projector's aim aligned to your screen should something bump the tray, you won't have to readjust it. (See this link attached for an example of a strap securing a projector).
(In all cases, if you have a building or school district maintenance administrator or someone who's job description requires them to be aware of state or district safety regulations/OHSA rules, they should be consulted to make sure you're following any safety issues that may apply specific to your classroom/student needs.)

The lamps degrade as do the LCD units, they get dirty.

try reset the lamp counter by pressing volume +,- keys together, may be fans not working or faulty lamp, check both

In the main menu, go to Settings, select System, and uncheck Ceiling (that setting is to allow it to be mounted upside down from a ceiling mount).

download the manual from infocus

I have a power supply for the LP250 for a fraction of the repair depot price. I could walk you through the removal and replacement so that you wouldn't have to ship the entire projector.

B.

Hello.

Your InFocus projector works with your computer through the VGA or DVI port. You don't need to download a driver.

Check out the manual (How-To Guide) from here:

http://www.infocus.com/Support/Products/Projectors/LP250.aspx

Hope this helps.

may be a dead DM3 board.
join google group dedicated to DM3 troubleshooting:
http://groups.google.com/group/dead-dm3

You power supply is dead. I can fix these units. If interested my ebay ID is gtitubro.