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pavilion dv7 4040ed won't start without battery... adapter or power jack?

I wanted to restore factory settings to remove w8.1 and get it back to w7.

 

Then I got a message saying my laptop was running on battery power, and that I should connect it to a power source.

Yet... it was plugged in alright.

 

So I shut it down, disconnected the power, got the battery out, connected it to the power and... nothing. It wouldn't turn on. So I figured the adapter must be broken.

 

What made me doubt that, is that when connected to a power source, the light next to the power jack turns on. Plus, it does charge my battery.

 

 

Anyway, my question is: is the adapter broken or is there something wrong with the power jack or even something else? Before I get a new adapter or get an expensive repair/check that's not needed...


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