My ViewSonic PJ458D problem

This is known as 'cycling' and is common with mercury-vapor bulbs nearing end-of-life. When the bulb first starts, it glows dimly and grows in brillance. As the light grows, the pressure and temperature of the bulb also grows--increasing power demand. After a short while, the demand exceeds the ballast limit and the bulb extenguishes until the temperature (and pressure) drop again. Then, the cycle starts over. Bottom line: you need a new bulb (or, the correct bulb).

I have the same problem, and cant find no answers, i just purchase a new bulb, and it is not come on, it use to come on with the old on, i put back in the old one to find out if the new bulb is the problem, but it was not, i got the same issue with the old bulb.

My pj458d ................i put it on and it cut off in 12 seconds wat is the problem