Dell PP22L wont power on

I have a Dell Inspiron 1520. The problem is that it wont power on. When I hit the power button with just the battery in I get the amber battery light on the side of the laptop.Then when I plug in the ac adapter I get blue and amber battery light flashing constantly.Still when I hit the power button I get a blue light for a sec then it goes back to the amber and blue flashing.. Then I take out the battery and try running just on the ac adapter and I hit the power button I get the blue power light for a sec then a blue battery light then nothing, No fan running no HD running either and no screen. I checked the adapter and the green light is on even when its not plugged into the computer so I figure the adapter is fine. Any help would be great.. Oh and I also checked the memory module and it was seated properly.