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This is likely to be some sort of heat isue where it sends itself into self preservation mode when it gets too hot and then will only turn on again when it has cooled off. Try cleaning any of the air ducts located in the back of the set to see if you remedy the situation.
Most likely the TV is detecting an internal problem with it's circuitry and is shutting itself off to prevent further damage. You'll need to have a professional look at your set to determine exacly what's going on. Aside from leaving the power cord unplugged for five minutes, then pluggin back in and trying it again, there's nothing anyone can do from here. Sorry.
Hope this helps, and please rate my advice, good OR bad.
Its the BULB people! You need to change it every 3 to 5 years! I have had my sony 55" for 6 years... I had Best Buy come out 3 years ago, changed the bulb... it worked fine. Just started flasshing and shut its self off and back on again. Time for another bulb.