I have a 10-year old 32" Sony Trinitron Wega TV. Once this past week, the TV did not come off when I pressed the "on" button. The "Stand b" light just kept blinking red. So, I unplugged the TV for the day; that evening, I plugged it back in and the TV came on. The TV worked for a few days, but, now it is doing the same thing. What could be the problem? Would it be expensive to repair? Thank you.