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HP Envy laptop will not power on, replaced power jack and light still off.

Hp Envy 15T - J100 touchsmart
Microsoft Windows Vista

I am tech working on a friend's laptop. it will not power up or boot up.

I tried all steps and done a hard reset, tried another ac charger and still won't

boot. I order a new power jack and replaced it but still no power. My friend bought this laptop close

to 2 years ago. is there any way to test motherboard. thanks for your help.

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HP Envy laptop will not power on, replaced power jack and light still off.

If it does not power on or POST that is your test. And it is not passing. 

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HP Envy laptop will not power on, replaced power jack and light still off.

Hi, It doesn't even start, I opened the case and tested voltage at DC in power jack and is getting 19.5 vs, I removed the ram and did hard reset and still will not start, lights are off.

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HP Envy laptop will not power on, replaced power jack and light still off.

You are just confirming more and more the diagnosis of dead motherboard. 

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