TV will not turn on. It seems that my Olevia after running for an hour or so would just turn

Question

It seems that my Olevia after running for an hour or so would just turn itself off. (It's been doing that for quite a while.) I thought that it was probably overheating and would let it sit. Then I started turning it off during commercials so that it wouldn't turn off during a program. Now, the TV will not turn on at all. The blue on/off switch sometimes will light up and sometimes won't but it won't turn on. I'm thinking that I've worn out the off/on switch. Thanks.