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Hi there and welcome
Can you remove the power cable and then hold the power button down for 60 seconds then release.
Then wait 3 minutes, connect the power cable and then try to turn it on.
Tell me if it then starts please.
Can you tell me please the make and model of the computer?
Can you also remove the battery and the power cable and again hold the power down for 60 seconds then release.
Then put the battery back in, connect the power cable and tell me if it now starts please.
ok, leave out the battery and only connect the power cable.
Does it then start?
It is the internal mainboard that has faulted and will be the power supply on it.
We have ruled out all other causes for this
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.
And if you can take a second to rate my service, that would be greatly appreciated.
If you need anything else please let me know
And please remember the service rating.