Can't use boot modifiers
Here's a strange one for you guys.
I just picked up a used MacBook that I'm working on refurbishing for sale. The trackpad needed to be replaced, so I took care of that. I also upgraded the hard drive and RAM (came with 2 GB upgraded to 4 GB). After all that was done, I went to format the HD and install a fresh copy of Mavericks. Strangely enough though, my usual method of holding down the option key at startup so I can select my Mavericks USB install drive did not work. When I tried, it just booted up normally. So I changed the startup disk in System Preferences and did the format and install figuring that maybe the problem would resolve itself with a fresh copy of OS X. Unfortunately it did not. I tried to reset the PRAM, and discovered that I am not able to do that either. In fact, when resetting the PRAM, it boots into recovery mode, so it is at least recognizing that I have the R key held down.
At this point, I started to explore the idea that the keyboard could be faulty. I first tried to use an external keyboard and saw no changes in behavior. Then I booted the machine and tested each key. No issues with any of the keys responding. So I don't believe that it's the keyboard.
Other troubleshooting that I have done:
- Checked to see if there was a firmware password set, There was not. I enabled a firmware password, rebooted, and removed it just to be sure that it was off.
- I tried installing the original RAM that came with the machine. No changes.
- I tried installing other RAM, both 1 and 2 GB SODIMM's, again, no luck.
So anyone have any suggestions? If it's not the keyboard, there isn't a firmware password, and it's not the RAM, what in the world could be causing this??