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since you have then lens out, get a wide blade flathead and insert it in the smallest part if **** that it will fit into behind the focus ring and turn the blade like you are trying to widen the **** all the way around until it pops out into it's normal position. Getting the entire lens back in properly is a bit tricky since the threads are easily stripped. First screw it all the way back on and then check the focus on the screen. You want to see a crisp image in 3 if not 4 of the outer corners of the screen. It is best to use something with text that fills the whole screen so you can see the 4 corners as you adjust the focus. If the focus is good in the corners, leave it alone. If not,hold the back of the projector in one hand and forcefully push the lens into where you screwed it on and see if it pops into place. It really is trial and error. Once you have a clear picture it is a good idea to remove the top cover and glue all around the base of the tube where it screws on so it doesn't come loose again.
Sounds as if you have some sort of foreign body within the unit possibly an insect I know this sounds strange but I have removed Mice from sets before now ?. How they get in is a mystery but they do and they can bung up the works .
A less helpful reason is that heat has caused some plastic to crack and drop into the lens mechanism , I have had that happen a few times usually from off the fan blades above the lamp now inverted on celling mounts puts the fan under the heat . An inspection by a qualified engineer may be the first step then decide what to do when you are told the cause ?. .. Regards Vortash
Make sure that nothing is obstructing the fan. Try to rotate the fan with your fingers to make sure it is free. If it is, you would be lucky if the fan is at fault because this is rather cheap and easy to find if not it is the main board which is at fault.