My keyboard stupidity.
Friend reported that her Sony laptop's keyboard was playing up. I too couldn't access certain letters on the keyboard and feared the worst because it persisted even after rebooting the machine. After some head scratching, turned out that this Sony's Num Lock remained on despite restarting the computer.
Lesson learned -- though I never got round to testing whether this was normal for all brands as I avoid using laptops because the keyboards are, generally, so awful.
In my defence, I should add that the Sony's Num Lock LED was particularly small.
Biting the hand that feeds IT
