Projector shuts off

most probably the lamp ballast is defective ,you need a new one

try it without the ups unit, just in case the ups unit is dodgy

you may need to clean it with a soft cloth that should help it may be dust

turn the projector up the other way,

or

Press the Menu button.

Select the Advanced menu. You see the features and their settings on the right side:

Press Enter and use the directional buttons and the Enter button to set the following option:

Projection

Front: Projector is in front of the screen

Front/Ceiling: Projector is in front of the screen, mounted upside-down from the ceiling

Rear: Projector is behind the screen

Rear/Ceiling: Projector is behind the screen, mounted upside-down from the ceiling

hi,
1. perss menu button
2. select controls
3. then select ceiling projecton (When you turn Ceiling Projection on, the projector turns the image upside down for ceiling-mounted projection. Highlight Ceiling Projection, then click either button to select turn this feature on and off.)
ok

buy a new 1,then look in the menu for it.

it has lamp which has 2000hour in normal and 3000 in econom mode to shinenormal then it must be changed and your may already in this state and began such things.

Yes it should be mounted upside down as you would not want to see the bottom of the projector all the time, unless the bottom is as good looking as the top, which I doubt. I wonder if you bought or got a ceiling mount rack with it. First mount the rack on the ceiling and then fasten the projector to it. And before that its picture has to be turned upside down too.

The user's guide says for ceiling mounting,
"Set Front Ceiling in the System Setup: Basic > Projector Position menu after you turn the projector on."

The user's guide is on the CD included with the projector as a pdf file. You can also download the user's guide here:

http://www.viewsonic.com/assets/006/5619.pdf

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It's not a short, the blub is near the end of it's life ~ the optoma is designed to detect when the blub is about to blow and shuts itself down. Turning the projector upside down or right side up usually only gives you a brief reprieve (some have reported a modest amount of extra time gained) on the blub ~ but in the end it's on it's way out and the projector will shut down again.