does the 508149-001 1100 watt replace the 508148-001 850 Watt? I noticed the 1100 watt PS has one extra pin on the P21 connector which I suspect provides another 12VDC line but The system work with the 850 watt PS before I plugged in the new 1100 watt PS. Is a troublr shooting guide availablr=e for the main system board? Thank you!!