My Latitude E6410 will not power on. If I press the power button, nothing happens - at all. But when I keep the power button pressed for about 15 seconds, the power LED comes on for about 5 seconds, then goes off again. When it comes on, nothing else happens. The screen, nor fan, nor anything else comes on. Just the power LED.

I tried clearing the CMOS memory (by removing the main battery and CMOS battery and pressing the power button for 30 seconds). Did not help.

Is this laptop dead? Other things I can try?