Memory problemsMemory problems ActionThe amount of memorydisplayed is less than theamount of memoryinstalled.The amount of available memory shown might besomewhat less than expected because of basicinput/output system (BIOS) shadowing in random accessmemory (RAM), video takes 1 MB, and ACPI and USBalso can take up to 1 MB.Verify that:1. You have installed the correct type of DIMMs foryour computer. See “Installing memory” on page 50for instructions on adding DIMMs.2. The DIMMs are properly installed and securelyconnected.3. If you added or removed memory, you saved the newconfiguration before exiting from theConfiguration/Setup Utility program.If the problem persists, run the memory test from thediagnostic program supplied with your computer. (See“IBM Enhanced Diagnostics program” on page 92 forfurther information.) The system might have detected abad DIMM and automatically reallocated memory toenable your computer to continue to operate.If you cannot correct the problem, have the computerserviced.88 User Guide
