Projector light turns off

It seems you assume that it is not an overheating problem.
The problem is, the bulb gets really, really hot when using the projector. It doesn't matter whether it has been there without any usage. As you switch it on, it will start to get hot.
But the lamp or other parts of the projector should not get too hot. To control the temperature, air is moved through the projector with the help of fans. Air enters through air filters and move through the projector absorbing heat from hot parts. This prevents these parts from getting overheated.
But what if air doesn't flow freely? Then the parts CAN get overheated.
First, switch on the projector and check whether you can hear the fans working.
Next, switch off the projector and remove power cable.
After about 30 minutes, remove the cover and check whether the air filters are blocked. If they are, clean them with a small brush.
This would probably solve your problem.

Did you confirm the on/off hard switch was in the on position? (My Toshiba has one) No LEDs light up at all?

leave it plugged in for a few hours and see how it goes im talking like 4 hours... if still nothing then it could be the fuse on the main power board.... hope this is helpful :)

If you have no LEDs then the projector is not getting power so the problem won't be the bulb.
First, check the mains power cable works. Try it in another appliance if you have one. Swap it of possible. If it has a fuse in the plug, change for a new one of the same amp rating.
Second, confirm that the wall socket you were using still works. Again use another appliance to verify it works.
Third, check the mains inlet on the device for a removeable fuse. I do not think that this model has a user serviceable however it would be worth disconnecting the mains power and checking carefully in the vicinity of the main inlet. It may be under a pop out panel, or a barrel type to be unscrewed.
You should replace this with one from a local hardware or electronics store, ensuring that you match the type very carefully to avoid any further damage.

If none of these steps help, you should contact Infocus service for help. It is likely that your power supply has failed. This projector last shipped in March 2007 with a 2 year warranty so it is unlikely to be covered for repair by this method. You may have purchased an extended warranty or other appliance insurance which could help cover the repair charges or spare parts.

I make sure the air filter stay cleaned and no vents are blocked I have had my projector 2 years. I had to send it in last year. And, it went out again today. I hate this projector and would never buy another one. My other projectors lasted 4 years before I had to even change the bulb. I use it everyday all day. They didn't tell me if it was the bulb or the fan. But again today it just quit while I was using it.

To reset the lamp timer you:
1. Turn off the main power button on the back of the projector.
2. Hold down the down, right, and enter buttons on the projector.
3. Turn the main power button on the back back on.
4. The projector should come on, hold down the buttons for at least 3 seconds after it comes on. If it doesn't come on, repeat the steps.
5. Turn the projector back off using the sleep button on the top of the projector. Then turn it back on. If it comes on and is functional, you have successfuly reset the lamp timer.

ballast is not striking the lamp and needs replacing

loose connection. possible crack on main board. needs to be sent in to have a look at.

This works on a couple different Toshiba models -- might work on yours...

Make sure the main power switch is OFF. Hold the "ON", "MENU", and "INPUT" buttons at the same time and turn the main power switch on. Keep them held until the yellow power standby light comes on, then let go. It is done.

the lamp light does not come on