Why laptop keep shutting down automatically after a few seconds?

My Toshiba satellite A300D laptop keep shutting down without prior notice, I have already cleaned the Fan and removed some clogged dust, I even replace old thermal grease with a new one and yet it keep shutting down after a few seconds, any idea with this problem?

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Hi,

Does it do this with the charger connected and switched on?

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And does it happen when the laptop is fully booted in Windows or before it boots to it's OS ?

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

Hello,

Do you still have this problem?

I used to have a similar one and found a solution years ago and was able to get it fixed.

I do need to search for the details of it if you need it.

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