Replacement power supply for a PowerSpec B639 computer
Trying to find the correct replacement power supply for our PowerSpec B639 desktop computer. The existing power supply measures 5.5 x 5.875 x 3.875 rated at 250 watts. Unit is marked "250 Watt HEC-250CN-2RU". Any suggestions? Space inside the case is limited. There is about 2 inches clear behind the existing power supply.