How I can fix my LCD projector?

I have a home theatre digital projector Chinese Model HP035. This projector under normal conditions, when connected to the power supply lights up a single LED, red at first and then green after the lamp is switched on. However, all of a sudden this LED does not light up at all when power is connected to the projector. The power supply from the wall socket is OK and so is the fuse at point where the power cable goes into the projector. I suspected the lamp initially, so I replaced a new lamp but the problem still remains. Please help.