IBM 220 - Manual (Page 63)

Chapter 5. Installing options 53
• If you installed additional memory, start the Configuration /Setup Utility
program and select Save Settings.
• If you just replaced a failed DIMM, you must start the Configuration /Setup
Utility program, select Advanced Setup, select Memory Settings, highlight the
connector or bank of connectors that you want to enable, then select Enable.
• In some memory configurations, the 3-3-3 beep code might sound during POST
followed by a blank screen. If this occurs, you must restart the server three times
to force the system BIOS code to reset the memory connector or bank of
connectors from Disabled to Enabled.