Chosen Solution
I have a strange issue: My Macbook Pro seems to have the OPTION key always pressed, even at startup, il boots with the partition selection screen every time, in Mac OS when I type something, strange symbol appairs instead of normal characters… I have replaced the keyboard but same problem… I tryed to disable OPT in the sticky keys options with no luck… so I tryed to unplug the keyboard flat cable inside the macbook and boot with an usb keyboard and it boots into partition selection screen like the OPT key is pressed. Could be a motherboard problem? Please help!
Let’s first go into your preferences > Startup Disk control panel. Make sure the internal drive is selected like this
Did that fix it? Update (08/26/2019) OK, lets do this: Open the Keyboard control panel > Input sources tab. At the bottom check the ‘Show Input in menu bar’ Once you do you should see a flag in the right hand side of the menu bar, click on it and open the ‘Show Keyboard Viewer’ You should see the keyboard keys responding as you type. Is the Option key working here?
Same problem to me… already replaced the keyboard… problem still remains Mid 2010 13” Macbook Pro (A1278) with 6 GB RAM and 256GB SSD drive.
I have got the same situation too! 2015 13” MacBook Pro. It just randomly pops up. Anyone manages to fix this?
