light on the bottom right of the TV for 30 seconds then it shuts off

I have the same Toshiba 49L621U model. When I turn it on, the toshiba logo shows up with a blinking ref light on the bottom right of the TV for 30 seconds then it shuts off. I’ve had the TV for 2 years but it sits in our guest bedroom and has only had 10 hours of use. I’m hoping it’s an easy fix.