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When you say the AC adapter fails to show that its on.. That sounds like the issue is with the ac adapter not passing power to the machine. Id suggest replacing the ac adapter itself, you can get a generic replacement here http://amzn.to/1W7GyQj and an OEM replacement here http://amzn.to/1W7Gpwb
The only other thing it could be is the DC input power board / jack http://amzn.to/1PB1UPj
But if your AC adapter doesnt show the green led light being on, then id start with the AC adapter first.. As if it doesnt pass power, then it must be replaced.
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I wouldnt think too much would cause an issue, unless it ran over the sides and got into the pin connections between the proc and mainboard.
I still think what you described sounds like an issue with the ac adapter. If it goes off when connected either the cord is grounding out , or the dc input jack is grounding out the cord.
Definitely still down to replacing either the cord, or the dc input jack / board.
Because even if you removed the dc input jack board altogether.. When you connect the ac adapter it should have a green light ( if you only connected the ac adapter to just the dc input jack removed entirely from the machine.
The DC input jack is a seperate board from the motherboard.
If you look at the link I sent you, which is the exact replacement for the G75 model, youll see the board is separate.
Youlll also see it has a pin connector where it connects to the motherboard.
Id make sure that you the connector from dc board to motherboard connected properly.. But again with that being said.
We test dc input boards by the manner I suggested. By connecting just a power cord to the board to see if the light stays green or shuts off.
I agree with your statement. On higher end machines they tend to seperate the dc input board from the motherboard for just this reason.
So the dc input board would fail from a power surge and could be replaced, instead of the motherboard taking the hit.