I have a Latitude d600 that just will not power up. With just the battery in - will not turn on at all (No lights anywhere). With the AC power cord plugged in - will not turn on at all (Battery charge light on panel to bottom left of monitor flashes slowly). With no battery in but power cord in - will not turn on (no lights anywhere).

Fitted a brand new battery and using a brand new power cord, battery charge light on solid, but laptop still will not turn on at all. Left the PC for about an hour with the Ac adaptor in and turned on. Charge light now flashing slowly and computer still will not turn on.  Self test button on both batteries gives me all lights lit.

Is this a bit more than a power issue and is the system board dead?