Infocus LP120 counts down then restarts counting down

your description of the shaking still is too vague. The best idea I have for you is to replace your cables if the picture is noisy/grainy. If that doesn't fix the problem it is likely the power supply not grounded properly and possibly not enough shielding between the power supply and light engine. If your image is jumping and flickering, it is also going to be the power supply.

replace all cables with NEW ones.

make sure you have the correct input selected. if you're using a computer, make sure it's on computer and not component.

it project?..but in 10 sec.it off? im pretty sure that the lamp ballast of your projector is defective. but if deadset? check the power supply and your power cord. if still not working your power supply board is defective.

if you are refering to the image shaking, you need to replace the colorwheel. if you mean the projector physically shakes, replace the fans and/or the colorwheel. they are the only 2 moving parts in the machine.

Its internal circuitry might be telling it to not run--a remnant request during the last cool down. Hopefully it is the fan itself. Try the master reset command. If you do not get an image before its shuts off, look in your owner's manual, count the way you manipulate the menu buttons to get to the reset, and try it between the moment you first turn it on, and it shuts off. Unfortunately some units will not let you input commands untill it is 'up to speed'. My Eiki is like this--nothing untill it is fully bright. Depending on your 'exploration' desire, short of going to a repair place, or buying a new one, you might try seeing if your unit is dirty, see if you have power to the fan (voltage meter--maybe 5-7 volts), or something is jammed in there. Depending on its age, the fan just might be dead, Jon.

you can purchase and replace the blower assembly- part # 505-1917-00. it's tricky, but you can do it. find an infocus authorized service center form their web site to buy it.

you could have a short

overheating or power supply problem.

this can sometimes indicate either an overheating issue, a lamp service life problem, or that the cover to the lamp housing has not been secured properly.