iam using a razer blackwidow keyboard for like 3 months and i didnt spill anything on it or drop any kind of liquid but for some reason my shift key isnt working anymore. i have tried holding both shift keys for minutes and etc. halp
Make sure one of the shift keys are not jammed.
The keyboard may have just died.
Install another keyboard and see if the problems goes away.
Make sure you do not have Windows Sticky Keys enabled.
If your keyboard came with some software try uninstalling it.
If that did not work reinstall it. (With reboots in between)