My vaio laptop boots but turns off.

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I had a problem starting up a laptop that I haven't used for 6-9 months. Yesterday, my VAIO PCG-71312L turned off and then turned off. I fixed the problem by taking out the CMOS battery but then another problem popped up. My laptop now turns on, boots, and turns off. Does anyone know how to fix this?

Thanks.

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Hello

Looks like a motherboard power supply issue.
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What do you mean by motherboard power supply issue?
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This:
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I think that is for a desktop not a laptop. Is there a smaller power supply for a laptop? Where is it located?
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Depends on the make.
I suggest you consult a technician