Well, I let it sit for 50 minutes.
It accepted the first key I pressed just now (that would be the 'W' at the beginning of this post). 😀
I can't say that this fixed it for sure, because it didn't always happen before, and considering the first key I pressed was technically 'Shift', I won't assume anything just yet. I'll continue using the machine with the hd option unchecked and let you know if it happens anymore throughout the next day or two.
If you don't hear back from me (and I hope you don't) then everything is good, and thank you very much. 🙂
The above can pretty much be ignored... 🙁