After writing WordPress 3.0 available for Download, I was signing into my gmail but continuously after trying my password for 3-4 times also, I was unable to log-in. Every time, Gmail was showing my password as Invalid.
At the first instant, I thought that some suspicious account activity has taken place and my emailed was hacked. I felt nervous and thought that the hackers have tracked the credentials of world’s best person 
Next, I tried to open mine yahoo emailed but it failed to login too. It was strange to me. I opened notepad and started typing something on it but when I pressed O key, 6 was printing on screen. All letters were appearing jumbled. I recognized that with Fn key pressed, I was able to type correctly. Now, I logined into mine emailIds by pressing Function Key and it worked. Mine gmail is not hacked . I tried my yahoomail and its also working fine now..
I noticed that function key is ON. I searched some on Google and got the way to disable function Keys. Just press Fn + NmLk both at the same time and you can enable / disable the function key.
A small way but quite a useful one. It blew me at first instant when the login was not getting successful. But thanks that now I am ok
My time wasted in searching the solution as I had no idea that what has happened else the solution was only a sec work as we need to press just 2 keys on the laptop and the problem solves. As in my case, just after I pressed the correct buttons, my issue was resolved.
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Nice tip
i bookmarked it.
@Shabnam Sultan: Thanks and Glad u liked it
This is of course a very useful tips for me. Thanks for sharing!
@techtrickz: Glad u find it useful