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The Lenovo Z70-80 was released in September 2015 by Lenovo, model number 80FG00DCUS.

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Runs great as long as it isn't turned off or unplugged

My laptop runs great as long as it is plugged in, and left on. If it gets turned off or unplugged it will not turn back on. The light indicating that it is turned on lights up and is solid (not blinking). The screen is black and the Caps light will not turn on. I can here the laptop running, fans etc. I tried all the usual tricks and nothing. However if left plugged in and “on” eventually it will boot up on it’s own. Hours or days later. What does this mean?

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It sounds like you may have a possible motherboard issue. I have seen similar behavior across many manufacturers and it’s usually a video card issue on the board. The fact that it eventually comes on is a new to me. It’d try a few things first.

Do you have your files backed up? If not, get them backed up.

Unplug the laptop and remove the battery. Try plugging in the laptop without the battery and see what happens.

If you have some spare ram to pop in, I’d remove the ram and put in some more ram to see if you have a ram issue.

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Thanks for the reply. It is currently running without the battery in it. There are two RAM in it. I have tried removing them and reseating them to no avail. The odd thing about this case is that it will eventually just turn on. I can just never unplug it. I'm thinking it is likely the motherboard. I think it may have something to do with the fact that I tripped on the power cord and it got yanked out. I have another power cord and it still performs the same way.

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Did the problem start after tripping on the power cord?

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LJ Cl さん、ありがとうございました!
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