Let's hear about the old PC and it's parts. Specifically the make, model of the PC and the PSU (power supply.)
I did fix one last week where the owner had used some HDMI to VGA cable. That was non-functional and no, I can not fix what is not supposed to work. We plugged into some HDMI monitor and it came right up.
Recently bought a 750ti to go with my old computer. Have it plugged into my PSU no faulty wires but when i try to turn it on my monitor enters power saving mode