Chosen Solution

as soon as I power on my dell laptoppower led and other three leds glow but after 2 seconds allm leds goes off and laptop dosent on.

This can be from several causes.

  1. Bad AC Adapter /and/or not enough juice when you trying powering on with battery.
  2. Defective Motherboard
  3. A bad fan/heat sensor shutting down to protect the system.
  4. Bad CPU (reseat & add new thermal paste)