I haven't used my //c in a few weeks, and tonight I've booted up and immediately hit an issue. While it will boot normally, a space character will keep repeating over and over, and the computer will not accept any other key strokes.
I have taken the entire thing apart, tried two different external power supplies, reseated all socketed chips etc. I looked inside the internal power supply and couldn't find anything immediately obvious (i.e. caps). I have tested the keyboard itself and the switch for the space bar is working as intended.
At first it was repeating the '1' character. Hitting shift or control would change this to another number, but I couldn't insert any other characters, nor would any other key presses cause a change. I also tested the '1' key switch on the keyboard and it too worked properly.
All disks will boot correctly, but it's stuck with this damned repeating character issue, which seems to be present after booting a disk (i.e. I can't use the keyboard).
Obviously with no keyboard attached the //c doesn't start at all, just brings up garbage on the screen.
Is this problem likely to be the keyboard or something else? I heavily cleaned the keyboard with electronic cleaner spray and dry lubricant months ago, it's the only thing that is currently hanging in my mind at this point. Otherwise the computer has had little work done to it. It was working well a few weeks ago, even following a bumpy move interstate!
EDIT: CTRL Reset and CTRL OpenApple Reset works, as does OpenApple+CloseApple system diagnostics (System OK message appears).
EDIT 2: With seemingly nothing to lose I'm soaking the keyboard in the sink at the moment, soon I'll give it a rinse and let it drip dry for 24 hours before attempting another go.