Check this link, usually if the power light blinks a certain amount of times its a code. I have a sony TV also and it did the same thing turned out it the lamp need replacement.
http://www.agoraquest.com/searchbb.php?term=sony%20tv%20flashing%20red%20light%203%20times&addterms=all&forum=all&submit=1&sortby=p.post_time&min_num=20
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