It is a defect that you need them to fix.
2. Review http://aumha.org/win5/a/shtdwnxp.php
I am using Windows XP and had just recently received a message saying my hard drive may fail. I called Dell and they replaced the motherboard. Now the computer will not shut down. Windows closes, the screen goes black and then the drive starts up again. I have to kill the power. Also, if I go to hibernate, the computer shuts down and then the hard drive fans comes on in a high spin. I then have to kill the power to shut it off.
Can you suggest what to do? My warranty runs out in 28 days.