Keyboard and trackpad issues

Not sure exactly what's causing this, but here are a few things you can try. First, reset the SMC and the NVRAM. Next, inspect the condition of the receiving connector for the trackpad cable on the logic board. Does it look clean and free of debris? Is the trackpad cable fully seated in the connector on the logic board and in the connector on the trackpad? Are both of the connector clasps in the closed position when the cable is inserted? Can you control the cursor with an external mouse connected? Is there any visible damage on the main logic board? Is the computer connecting to any Bluetooth devices nearby (it may be set to ignore input from the trackpad if it is connecting to a Bluetooth mouse or trackpad)? Have you verified that the keyboard cable is fully connected to the logic board and that it and its connector are clean and in good condition? These are a few things you could check. Best of luck!