I have a coby kyros 7024 model and the touch keys (search, back, menu and browse) suddenly stopped responding (those keys are lighted up as well).
I tried with a system reset as well but not worked.
Note: I tried with "adb send keyevent" command and verified menu, back keys are working via that command on my android. So this may be an issue with hardware .
Please help me to resolve this issue.