I've got a late 2010 unibody MBP 15", it has worked flawlessly until just recently the 9,O,and L keys stopped working. Nothing liquid has ever been spilled on it just seemed like a fluke thing. So I purchased a new keyboard and backlight and replaced it. The keyboard works fine but now the trackpad tap left click is stuck down. The track pad physicaly clicks just fine, but if I move the cursor with the trackpad it begins selecting things as though I have the left mouse button held down...I have to restart to "unstick" the left click. I have tried a USB mouse and this works as it should UNTIL I touch the trackpad at all, then this does the same thing until I restart. Right click continues to work as does 2 finger scrolling and any other gestures. I have tried enabling the mouse keys accessibility feature and this allows me to click just fine even if the trackpad and USB mouse are not left clicking. I'm stumped, I've hooked up the old keyboard thinking that was the issue, same thing. No software updates available. I've reset PRAM and SMC numerous times. Bluetooth is off and I have never had a bluetooth device synced. I've created a new account, same thing. In fact the issue occurs even at the login screen. I've tried without the battery in, same thing. I just can't imagine unhooking the track pad from the logic board to replace the keyboard would cause this, anyone have any suggestions? I've also noticed the fans seem to be running at full speed constantly as well.