MacBook Pro Won't power on at all!

This is a real odd one! My friend's MacBook Pro had a broken O key, so he took it apart to replace the keyboard, but didn't know how to put it together so he gave it to me. I meticulously reassembled the machine, and now it won't power on! When plugged in the green light comes on the magsafe charger, and the battery indicators light up fine. Then, the sleep light start s to fade in, but abruptly stops. If you listen very very closely you can hear the fan initiate then stop in time with the sleep light. Took it to the Apple store where the technician said he couldn't figure out what was wrong, but that everything seemed to be assembled correctly. Have already tried SMC and NVRAM resets to no avail.

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How did you fix the keyboard? Did you replace the upper case or did you get the keyboard unit and put it in?

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Black Friday
Broken doesn't stand a chance.

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See if it will spontaneously boot. Remove mag-safe. Unplug battery. Press & hold power button for ten seconds. Reconnect battery and mag-safe. You should get a boot. Then see what you can find out.

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I did try removing the battery and using the Power Adapter, and at the Apple Store the technician tried that method to jump start the machine, the same sleep light/ fan sequence occurred.

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