Chosen Solution
Hello, I replaced the trackpad of my Macbook Air and after the power up trackpad and keyboard are working fine. Then I type in my password and the system is booting. After this reboot keyboard and trackpad are completly dead. An external mouse is working fine. The system reports, that there is no keyboard. I rebooted several times, but the behaviour is still the same: right afer power up keyboard and trackpad are fine, when the reboot is complete, both are inoperable. I resetted the NVRAM, no change. Is anybody having an idea what to do? Many thanks in advance. Tom
Try a trackpad cable, but I doubt this will fix the issue. Also try booting with the keyboard disconnected, enter the password using an external keyboard and see if the trackpad still works after boot. Sounds like an issue with the PCH to be honest, had one like this before where the trackpad and keys would work in the boot up selection menu, but when in an OS it would stop working. Why did you replace the trackpad by the way? Was it working fine before you needed to replace this?
OPTIONS This problem has to do with the top casing (keyboard). It occurs when the keyboard is replaced with another keyboard of a different model. Unusual power consumption of the new keyboard causes the random trip offs. For example if you try to use another component (eg inbuilt iSight Web cam) that shares the same USB hub, the keyboard/trackpad trips off. Also restarting the system trips off the keyboard/trackpad. There’s a temporary fix though… If the keyboard/trackpad trips off, use the system till battery dies and goes off by itself; leave it for about a day without charging, then plug in the charger and turn on the system. The keyboard and trackpad should come on. When you have your keyboard/trackpad working; my advise is: Never restart your system. When you are through working with it, just close the lid (sleep), DONT SHUT DOWN OR RESTART! Don’t use the inbuilt iSight camera. GOOD LUCK.
