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Why doesn't my computer turn on? Why doesn't it start/load in?

I got this Macbook from a friend and he told me that it didn't start.

I took it apart and went to town. There were missing screws everywhere (might cause grounding problems?). The keyboard is sticky so I assume some liquid damage, and other than the fact that the laptop looks like it's been torn apart (quite badly if I may say), it's a perfectly (cosmetically) fine laptop.

Here's what I've tried so far:

Replaced the battery

Tried to reset the SMC (Maybe worked?)

Getting Green light on the Magsafe 2 Charging light

Occasionally, I'll be able to turn on the laptop and maybe get 1/32 on the loading bar.

3-4 times I've been able to log in into the profile after some experimentation, but I haven't been able to repeat it consistently.

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Unplug the keyboard cable, reconnect the battery, then plug in the charging cable (it should boot).

If it still does not turn on in this state, remove the SSD, use a SATA to USB cable to plug in a known working HD/SSD to the USB. With the keyboard plugged in, hold the option key and try booting into the known working drive.

Missing screws won't cause grounding issues, unless the big screws for the battery, or the square battery connector are missing, but it will still boot without these.

Check the underside of the board for liquid damage, and clean with 95%+ isopropyl if any is present (take a picture of areas affected before cleaning though, for reference if needed).

I suspect it is either the power button, sometimes working on it's own, or a fault with the SSD (formatting or bad drive). Try the above and hopefully you can narrow it down.

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Have you tried another power cord. sometimes it is the cord that has the problem. I had this problem with my hp pavilion. I got a better cord so now it will power up but if you dont get the rihgt cord it may not charge like mine does.

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Yep, I have 2 chargers, tried them both

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some of the connectors might be dead

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Edward Hu 将永远感激不已
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