HL-R5067W Lamp Indicator blinks with no Picture/Audio

I have a HL-R5067W 4 year old DLP TV. Lamp indicator blinks but the TV does not come on. Lamp stays on for 15 seconds along with fan running and then it turns itself off. I do not hear any typical "chime" nosie when turn the power on either. Also, lamp door switch postion has no impact whether it is up or down. Help.....