My MBP recently started acting like someone is hitting the space key nonstop. It's making the computer unusable. I have it set up as a desktop replacement, using a Bluetooth keyboard and mouse. I have looked into the following: 1) I thought it was the BT keyboard acting up (it's nearly 8 years old), but disconnecting it and removing it from the list of BT devices - the issue persists. 2) I thought maybe something was pushing down on the MBP's keyboard - the issue persists even with the display flipped up. 3) Tapping the MBP's space bar seems to fix the issue for a second, then without hitting any other keys, it starts up again with the spaces. Doesn't seem to be a stuck space bar. Given that I haven't used the MBP keyboard in ages, this makes sense. 4) Haven't messed with the keyboard settings in ages, so that is not the problem. 5) Tried a reboot - no dice. Any thoughts?