Jeff's dashboard

Hello,
I have a Dell Latitude D505 Laptop Svg Tag # 3Qvnb71 It wont power up on battery or cord
when you push the power button it does nothing. I am dissappointed because this unit is one of 30 we have and this unit is only used as a spare. I cheked with dell parts and they told me 535.oo for a mother board WOW! Help me DELL