Arrow keys not working: Hardware issue?

totebo

When I press LEFT + UP + RIGHT on Macbook Pro Event.KEY_DOWN doesn't fire for any of the keys.Pressed separately they appear to work. Hardware issue?

SinisterSoft

In some keyboards some key combinations don't work - it's a result of both the circuit layout and the code in the keyboard microcontroller. Plug in good quality USB keyboard and see if that works (if it does then it's just the keyboard can't cope) - or boot the Mac in Windows (using bootcamp, not an emulator) and if that works then it's the Mac OS itself.

https://en.wikipedia.org/wiki/Rollover_(key)

antix

Interesting. I made a quick test and double key combos always work, left/right/up registers nothing, and left/right/down works. Strange indeed.

totebo

When I first bumped into this issue I remembered I had had a similar issue with a web game way back. Since it was a while back I wondered if keyboard manufacturers hadn't fixed this bizarre shortcoming. Obviously not.