You have a rather old motherboard. Try making a CMOS reset and turn on the computer without any drivers or graphiccards. Just plug your monitor in the onboard VGA port and see if your PC works again. What could also be damages is you RAM or ramslot. If you have more than one RAM module try pulling one out and place it on the different slots. Do that for every RAM module you have. If that doesn't work either you have only 3 components that can be damages (assuming your new PSU is working properly): CPU, RAM, Mainboard. With thus configuration your PC won't boot anyway, but it should halt at ''insert boot disk an press enter'' ir something similar.