MacBookPro not starting after removing battery/cleaning track Pad, etc

Some dust got inside the track pad of my new MacBook Pro 13" Model A1278 (bought brand new in May,2014). I followed a tutorial video of how to clean the track pad, which involved unscrewing/disconnecting the battery to get access to the track pad, disconnected the track pad carefully, cleaned it and replaced it, then replaced the battery. The MacBook was not connected to the MagSafe adaptor while doing this, the power was also turned off. There was about half the battery charge left when I began this procedure, which didn't take long to do. After connecting everything, and making sure it was as I found it, I screwed the back panel on again and pressed the power button to start up the MacBook, but it did not come on. I connected the MagSafe power adaptor, tried to power on again, and still nothing. It is dead. Although I noticed that the MagSafe adaptor has a very feint green light (nowhere near as bright green as it is when in good health). I am thinking that while removing the battery, using a small metal screw driver, I may have lightly touched the silver contacts that are beside the battery connector/plug for a split second. By doing this might I have short circuited the logic board? I joined another technical forum earlier today and someone said I may have done this. But could there be another reason I can't power up my MacBook? I hope someone can help. Thanks.

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drag pad = trackpad?

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yes, track pad.

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Ok, so I have had this issue before. First, dust may very well have made its way into the DC-In board. I am not sure which model of the MacBook Pro you have, but you will have to find the guide to remove the Magsafe DC-In Board for your model here. Remove the board and clean both the magsafe contact part of the connector and the logic board contact part of the connector, as well as the socket on the logic board with +90% Isopropyl alcohol. Also, clean the keyboard ribbon cable. Try to power on after this, if you still get no power, your keyboard may be damaged (power button runs off of the keyboard). To see if it is indeed the keyboard that is broken and not the logic board, find the "power pads" on your model's logic board here. Take a pair of tweezers and touch both contacts at the same time (with the battery connected as well as all other components) for several seconds. If you hear a startup sound, then you know that the logic board is, for the most part, in good condition. Try these methods in order and let us know if you get any results.

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Thank you. Busy today with various other things, but your advice sounds good and is much appreciated. I will let you know how it goes if I find I need to follow your instructions.

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Re The tweezers I should use for touching the power pads. Are we talking here about some specialist electrical tweezers, perhaps with plastic/rubber handles? (Something I don't have) or will an ordinary pair of metal tweezers, like the ones in the bathroom cupboard? excuse silly question, but just checking as am being cautious not to make the situation worse. thanks.

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Not a silly question at all. The voltage on a MacBook Pro is very low, it can't hurt you (10-14 volts), so a pair of regular tweezers will be just fine.

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Go over all the connections again. 99.0044% of the time a connection(or) that was thought to be good (straight, solid, complete) is not. Often ribbon cable connectors (which use cam locks) are not inserted completely, or were "connected" without opening/closing the cam lock.

The "on" button runs through connections in the top case to the logic board... the trackpad is part of that circuit. If you damaged or miss-connected the track pad that could be your problem.

If this answer is acceptable please remember to return and mark it.

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I did not know what cam locks are, but having done an image search for 'electrical cam locks' there is nothing I have touched, or anything in the MacBook I can see that looks like any images of cam locks that I found. There were just two connections I disconnected, the battery connector and the track pad connecter, and they were flat black plastic and rectangular, very easy to take in and out and not really any room for getting the connection wrong, they just pull out and then push back in place again. The only variation you can have really is on how much or how little you press the connectors down in place, and I have tried variations degrees of compression already, from pushed in tightly, to just pushed in lightly, and still nothing works. I would presume you just reconnect them by pushing them down, not too forcefully, back in place, until they are a snug fit. Which I have done. I have checked and rechecked both the connections for the track pad and the battery.

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Step 39 — Trackpad

Use the flat end of a spudger to flip up the retaining flap on the trackpad ribbon cable ZIF socket. Ribbon cables often end with CamLock Connectors... if you tore the connector off the board this would explain your problem.

Be sure you are prying up on the hinged retaining flap, not the socket itself. On reassembly the ribbon must slide all the way in until it stops (with the locking cam UP to allow this), then the Cam must be flipped (pressed) back down to hold it in place.

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Have you also detached the keyboard? Power Button is part of the keyboard.

If yes try to stick a tape on it and pull it all the way in to the connector. Then lock the connector.

Also try an SMC reset.

The last option would be to short two power on pads on the logic board to see if the machine powers on.

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No, I didn't disconnect the keyboard.

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I did try the SMC reset instructions for "Portables with a battery you should not remove on your own" except for stage 1 of this process which is 'Shut down the computer' I can't shut it down because it's already shut down.As for 'shorting two power on pads on the logic board' I do not know how to do that, I would have to do more searching to know what that is, unless you can tell me. Thanks for trying to help :)

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it looks like someone has been found to mend the laptop free of charge, will keep the thread open just in case. thanks everyone for your help so far.

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Ian Lyne will be eternally grateful.
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