Have you tried it with the video card uninstalled and only use the internal GPU on the MB? Made sure the internal GPU was enabled in the BIOS? Plugged the monitor into the MB port? Is the monitor set up (on-screen menu) for the correct input?
If you still have no signal then try a different monitor AND a different comm cable to the MB. If you still have no signal then bad MB.
If you do have a signal the go ahead and update all drivers for the new computer. Get everything working. Then try installing the new card. Move the monitor comm cable to the new card . Boot into the BIOS, change video output from the MB to the card and get into Windows. NOW install the drivers for the new card and then restart.