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Why doesn't keyboard and trackpad work after battery replacement?

I replaced a dead battery on my MacBook Pro and now the keyboard and trackpad aren't working. The battery works fine, but the fans come on like gangbusters and won't go off. I can use a remote keyboard and plug in mouse but the fans blow and blow. I did my best to reconnect the track board ribbon but clearly something is amiss. Help!

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It sounds to me like something just isn't connected properly. IIRC there's a temp sensor integrated into the touchpad, and if it's disconnected the fans will run full blast. I'd probably just re-do the repair and reseat each connector really carefully, making sure the ribbons are straight and fully inserted, and that they aren't connected upside-down or damaged in any way. Let us know what you find. Good luck!

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Yeah I would recommend doing what Jeff said. If the trackpad isn't clicking anymore something went wrong during the battery replacement. Resetting NVRAM and SMC won't fix that. I would just open it up again and redo it very carefully.

Also you should be able to reset NVRAM and SMC via USB keyboards for future reference.

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Thank you for your support. I will try opening it up again.

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Have you tried reseting the PRAM/NVRAM or SMC?

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Thank you--this was one of the first things I tried. The keyboard doesn't work, so pushing down keys, even to reset these, has no effect. It does light up, though. I tried with the computer off, and I tried with it on. I tried with a bluetooth keyboard. I turned bluetooth on and off. Nothing works.

At this point the computer works with a bluetooth keyboard and plug-in mouse. The problem is the fans going full speed, which tells me something is wrong. The computer was fine before I changed the battery--it turned on when plugged in, and the keyboard and trackpad worked. Now the trackpad won't click, so I have obviously done something wrong putting the thing back together. I have done successful repairs on another MacBook pro, but I'm afraid this one made a mess of things on this trackpad/battery assembly. Thanks though, for your help.

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