The closet error code is the "Hardware component failure" ; therefore, disconnect everything possible including the Keyboard & Mouse, any PCI card(s) except the GPU, and start the PC. If the problem persists next unscrew ALL of the MOBO standoff screws and any PCI screw -- and dangle the MOBO on a towel away from ANY contact with the case or anything conductive.
One short beep = VGA detected
Quick boot set to disabled = No keyboard detected
One continuous beep followed by two short beeps then a pause (repeated) = No memory detected
One continuous beep followed by three short beeps = No VGA detected
One continuous beep followed by four short beeps = Hardware component failure