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How about a little more information? Does the projector turn on? has it ever worked? What type of interface (VGA, DVI, HDMI, RCA) What type of computer (notebook or desktop)
That being said, double check your cable connections and make sure you tell your computer to look for the projector (Dell laptops used to use FN+F8 to switch from laptop to projector). Windows 7 has a menu choice "Connect to Projector". Mac computers - check system preferences and make sure the projector is ON before you plug it into the Mac.
It is not a common problem. Ballasts rarely need repairs. Have you reset the lamp hours to zero after installing new bulb? If, yes to confirm about ballast please ask the TV repair shop man whether previously he had repaired any DLP projector. There is lot of difference in technology of DLP projector & TV (except DLP Projection TV).
The problem could be in the projector main board. The lamp lights after getting Lamp ON signal from the projector main board. As the lamp ignites the ballast sends the signal of Lamp Lit. If the projector board senses that any blower/exhaust fan or colour wheel is not running then it will send a signal to Switch OFF the lamp. If you are tech-savvy then do as follows to check about lamp & ballast. Remove 5 pin connector from the projector. Connect projector to mains supply. Get a 5V DC power supply. Connect +ve to pin 3 & -ve to pin 4 of the ballast connector from this supply. The lamp should light. If it does not light then there is problem in the ballast (if the lamp is new). To give a chance you can check it for your lamp which lasted 20 minutes. Generally ballasts are made by OSRAM. You can get the ballast from OSRAM dealer. You will need the part number for that. Take out the ballast, it is there on it.
could be a bad cable which is the cheapest to try. wiggle the wire at the back of the plug while viewing the picture and see if it changes at all. if it does, the cable is bad. if not, then you probably have a bad lcd cable/connection or a burnt polarizer.
reset the settings to factory default and make sure the resolution matches (native is 1024x768, max is 1280x1024). also activate the port on the computer. if none of that works, swap out the cable (vga-dvi). if all else fails, you'll need to send it in for repair.
I am unsure of this from your post, but don't try to hook the projector up to the laptop while either one of them is on. Power both the laptop and the projector off, hook up the projector to the laptop, then power on the projector first then the laptop. If you are already doing this, I apologize for stating the obvious.