Didn't have a graphic card it was purely for number crunching so just two processors, lots of ram and a network card.
That's unusual. All the MBs I've come across must have a graphics card fitted in order to boot, even headless machines.
Are you sure there isn't an integrated graphics card on the motherboard?
Regarding faulty capacitors: The tops must be absolutely flat. Any hint of curvature indicates trouble. It is possible to replace them but not as a first time soldering project.