IBM x3655 Service Guide - Page 131

v Follow the suggested actions in the order in which they are listed in the Action column until the problem is solved. v See Chapter 4, "Parts listing, System x3655, Type 7985," on page 97 to determine which components are customer replaceable units (CRU) and which components are field replaceable units (FRU). v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a trained service technician. Beep code Description Action Three short beeps Memory error. 1. Reseat the DIMMs. 2. Locate the failing DIMMs: a. Remove all DIMMs from the server. b. Beginning with the primary bank of DIMMs, return one bank of DIMMs to the server at a time, restarting the server each time, until the beep code error returns. c. Replace one pair of DIMMs at a time in the failing bank with an identical pair of known good DIMMs, restarting the server after each pair, until the beep code error returns. d. Replace one DIMM at a time in the failing pair with an identical known good DIMM, restarting the server after each DIMM, to identify the failed DIMM. If the beep code error remains after you have replaced both DIMMs, go to step 3b. e. Repeat steps 2b through 2d until you have checked all memory banks. 3. Replace the following components one at a time, in the order shown, restarting the server each time: a. DIMMs b. (Trained service technician only) System board Chapter 5. Diagnostics 113