power problems with laptop???

[bonz1121]

i am trying to figure out whats wrong with my uncle laptop. he has only had it for 6 months and had been working fine. he said one day that he went to turn it on and nothing happened. when i go toturn it on and i have it plugged in its always the same. the lights on the keyboard and display come on for about 2 seconds and then go off. ive tried different external batteries and no luck. this is a brand new laptop so i wouldn't think that it would be the power supply, would it? if so how can you check to see if ones still good or not.
ive got experience in computers and have taken apart my share of laptops. so if anyone has any ideas on what could be wrong let me know. here are the specs on the computer.
DELL Latitude D600

[glc]

If it's only 6 months old, it should still be on warranty and you should be talking to Dell. Taking it apart yourself will void the warranty.

I'm removing your detailed spec list as it's not necessary and takes up way too much space.