Sony VGN shuts down ,clicks off, on start up,

Has new CPU and heat sink compound. Fan works.
Sometimes it clicks off a half second after I push the start button.To quick to be a heat problem.
Other times it will run for hours and ten click off. No a normal shut down but with a click that sounds like a circut braker.
Any help would be much appreciated.I have tried another power supply.

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Reply to: Sony VGN shuts down ,clicks off, on start up,
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Clarification Request
Tell the rest of the story.

Why did it get a new CPU?

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Sony VGN

Heat sink fins were cloged so I thought it may have fried the CPU.
Just a shot in the dark. $30.00 down the drain.

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Still too short on detail and story.

Many CPUs are incompatible. And which VGN? Too many.

Did it do the same with the old CPU?

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Son vgn

Its a VGN-NR22OE Model PCG-71136
I used an exact replacement CPU, same specs etc
No change. Clicks off same as with old one.
Thanks for the help.

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That model found your post. Not a Sony?

Trying VGN-NR22OE find the usual pentium laptop from 2007. While it's a little early for a total failure the battery should have failed a few years ago. Many owners keep that old battery and it can fail in a way to overtax the motherboard.

Try it without the AC, pull the battery, press and hold the power button for 60 seconds. Now do NOT install the old battery, apply AC and try one last time.

If no-go then it's too likely the motherboard needs to be swapped.
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The battery is dead. Have been using AC only for about 6 months th battery has been removed. . I purchsed a non sony battery that came with an instal disc. I have not been able to get it to reconize the battery. If I put the battery in
it will tell me to go to hibernate. The shut down problem started before I tried the new battery.
What actually makes the Click or snap sound when it shuts off? Could there be an oveload protector that is weak? I reinstalled windows using F10 back to when it was new thinkng it could be a virus.
If it's the mother board then it all over. Time for a new one To bad because it works well when it stays on.

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That's a fine clue

That the motherboard power supply circuits are damaged. This STORY is typical.

And no, there is no overload protection against old batteries. Somewhere I'm sure it is written to replace a battery when it's failed but folk continue to leave it in hoping it will charge up or come back.

The motherboard dies.

At least we tried that old generic reset.

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Sony VGN

Hi myvgn,
So that Sony may better assist you, please send an email to including your name, address, computer model and serial number, what issue you are experiencing with your comp. and a phone number where you may be contacted. Please put "Cnet Forum" in the subject line.
Thanks =~)
Evelyn Perez

CNET Forums