Dv6000 Black Screen won't boot

Hello,
I have a HP DV6000. When I tried starting it this evening, the screen stayed black, the fan would run and then it would power off, power itself back on and then off again. I have tried the following solutions with no luck;

Removed battery and power chord, held down power button for 1 min
Tried starting with just the power chord (battery removed)
Tried starting with just battery
Tried removing the RAM and starting

None of these solutions have worked for me....does anyone have any further advice, I will be replacing this system shortly and am more concerned about getting some files backed up to my external drive before pitching this one. Have had it since 2006 and the problems seem to be getting worse. Ready for an upgrade, just trying to salvage some files