Did you ever get it working again? I am having a similar problem.
Can anyone help?
I wanted to disable the home button at the lockscreen I did this:
1) Made backup of /system/usr/keylayout/gpio-keys.kl
2) edited it to make the power button not work at the lockscreen.
It worked.. but then I wanted to change back as I didnt like it.
deleted the file, and pasted the backup one in the same location.
rebooted but I still cant use the button
I'm having a similar problem with mine. I messed up trying to install a build.prop then went and installed ICS 188.8.131.52 WW GEN1 something again and now the Home button both the software and the tablet button don't work. :c
I saw a fix for installing "latest gapps" but I can't find those for the a100 unless it's for some CM mod.