I think the ML370 has a riser cage, which is the PCI board that plugs into the mother board. Reseat that, most of the time that is the issue. Or, just check for seating issues. The amber LED on the front indicates an internal fault.
Like I said, just reseat your processors, memory, fan connectors and power supply connectors. If you have a riser board then definately reseat it.
Good Luck.