No signal

And don't put anymore working ram into the motherboard. It is likely that your psu spiked or no longer functions properly or a voltage regulator no longer functions properly.

 

I haven't done nothing with it since last month

 

Pentium 4 agp board.. might be hard to find an exact replacement. And I would check the psu to make sure it's good before using it to power anything else with. Is xp your main os?

 

This XP is not my main os. My main os is Windows 7 is my main pc / laptop