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Hi there and welcome
When the TV shuts down, is all power lost? Do you see any of the LEDS showing at all?
ok, but does it shut down normally? Or it just goes off in an instant?
And which version of windows are you using?
It is not a software issue then Marilyn, its the mainboard and will be either the onboard power supply or the voltage regulator. This is why it goes off instantly and will be related to when the Laptop warms up, which is why it goes for some time then shuts off again.
I am really sorry about this and you are going to have to return the Laptop to have this replaced. It will be covered by the warranty if this has not expired, and the replacement will be done at no cost to you.
I am really sorry about this, and if you have problems, or would like any additional information or assistance, please do not hesitate to let me know.
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Your most welcome
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