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how can i fix my dlp projection sony tv model kdsr50xbr1?

when i turn the tv on it immediately turns off and the red light blinks 4 times. I have unplugged the power cord for several minutes and hours and no change. It happened several weeks ago and when i vaccumed the dust out around the two fans in rear of tv it worked for about three weeks but hasn't worked this time. Help Please.
mike w, August 2012
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