The light bulb is flashing. If the bulb life is ok, it may be that the temperature inside the machine is high. At this time, you should check whether there is too much dust in the air outlet. It's best to clean the machine and see if it can solve the problem after cleaning. If you can't suggest looking for an after-sales center.

For the problem of green, you can connect the projector to see if the projected picture is green. If not, it means that the background color of the projector set in your menu is green. If the projection is green, it is necessary to check whether there is any problem with the VGA interface of the projector or the color wheel (LCD chip if it is a LCD machine) if there is no problem with the VGA cable.