2400MP Flashing Orange Power Button

When I turn on the projector, it does shows the blue Dell screen, but no video.  I have always had the same video settings; the problem just started.  After 5 minutes, the projector shuts off, an the power button begins to blink orange and the fans run very low.  Only the power button blinks, nothing else on the projector.  I have unplugged it, left it for a couple days, but the same thing happens.  I am able to get audio, but no video besides the Dell blue screen.  Also, I replaced the bulb and used compressed air to clean what I could.