IBM PS/2 Model 8555 (new) Power Supply Works perfectly!!!
When I first installed the IBM PS/2 Model 8555 (new) Power Supply it didn't work. Then I checked the voltage switch on the back and it was set to 250 volts so I switched it to 120 volts and it started working just fine and powered up the IBM PS/2 55SX. A very reasonable price for a new PS/2 power supply as it is getting hard to find a new one.