If your laptop turns off 4 or so seconds after you have turned it on it might be that your power button is stuck on. This will cause the Laptop to turn off.
If your laptop just immediatly turns off then check that the fans are coming on. If not then take it to the vendor for repair.
If the laptop comes on and gets to a desktop then shuts down try the following.
When you apply power to the Laptop keep pressing F8.
You'll get a menu system.
Select Safe Mode from the menu.
If you get a desktop you might have a virus that is preventing you from getting to your normal desktop.
Take it to your vendor and get them to remove the virus.
Hope this helps.
SlySi, April 2009