After doing this the computer starts up but no display appears on the monitor. When using a vga cable it says check signal cable on the monitor, and when using dvi it does not, but either way there is no display. We have replaced both the graphics card and the motherboard and still it is not working. We don't think either of the new components are damaged although it is an unlikely possibility. We know the monitor works as we have tested it on another pc.
The hard drive still has the drivers for the old graphics card on it as we have obviously been unable to wipe it due to having no display, but I do not know if this will make a difference. Does anyone have any ideas on what it could possibly be?