System-board external connectorsThe following illustration shows the external input/output connectors and the NMIswitch on the system board.MouseKeyboardSerial 1(COM 1)VGALPTSerial 2(COM 2)USB 4RJ45RJ45NMIUSB 3Light path diagnostics panelThe following illustration shows the remind button and the LEDs on the light pathdiagnostics panel. The light path diagnostics panel is inside the server under theleft-side cover and the error LEDs are also visible through the left-side cover.CPU VRMS_ERRMEMORYDASD/RAIDNMISP BUSFANPOWERSUPPLYPCIBUS21CONFIGTEMPREMINDSEE INSIDE COVER FOR MORE SERVICE INFORMATIONUse the remind button on the light path diagnostic panel to acknowledge that anerror has occurred without taking further action. When you push the remind button,the system error LED will flash every 2 seconds until the error is fixed. If anothererror occurs, the system error LED will then stop flashing and return to a solid onstate.For more information about light path diagnostics, see the Problem Determinationand Service Guide on the IBM System x Documentation CD.The following table lists the light path diagnostics LEDs, the problems that theyindicate, and actions to solve the problems.16 IBM System x3500 Type 7977: User’s Guide
