Steve Owles complained about his dell laptop D520 battery that it does not hold any charge anymore. It only runs with power supply connected to it. I had to run the diagnostic tool installed by dell on the hard drive. That did not pick up any problem with the health of battery.
Then I thought of using his battery onto another dell D520 just to see if it works well on another machine. Tried and it worked and eventually worked on Steve's laptop aswell (STRANGE).

I had build a new Laptop for Barney. While hand him over his machine he told me that since last couple of days his machine's been prompting that his password going to expire very soon and change it. So I changed his password onto his present laptop and shut it down and gave him away his new laptop. The job was not finished. He logged acall soon after that he couldn't log in using his new password.
So I had to go through it and found that he has been using wireless and hence his machine been using the cached password and not allowing him to use the new one. I put him onto LAN and asked him to log in. It worked for him.