Okay, the Integrated Graphics is dead.
Therefore, I assume that you are connecting your monitor to the output port of the 9500GT, right?
If so, when you turn on the PC. Something must come up in the monitor. Press "Del" and you should enter into the BIOS menu if the motherboard is still good (if no display come up, then the mobo might be dead too). If the mobo is still alive and you are able to get into the BIOS, there should be an option there to select which graphics card to use, IGP, discrete ( or labeled PCIe ) or both.
Read your motherboard manual for specific info how to work in the BIOS. Get back to us if you are not able to find the solution there...