Mitsubishi WS-65313 Solid Green Light - TV Dead

I have a 10 year old Mitsubishi WS-65313 that won't turn on. When plugged in, green power light is on (solid) but no picture/clicking/anything. No response or change to green light when power or any other button is pushed. Checked switches with ohm meter, all OK. Only way to get green light to turn off is to unplug. Any ideas what to check? Thanks.