HP Dc7700 HP Compaq dc7700 Business Desktop PC Service Reference Guide, 1st Ed - Page 245

Troubleshooting Without Diagnostics Solving Memory Problems Ä CAUTION: Power may still be supplied to the DIMMs when the computer is turned off (depending on the Management Engine (ME) settings). To avoid damage to the DIMMs or the system board, you must unplug the computer power cord before attempting to reseat, install, or remove a DIMM module. For those systems that support ECC memory, HP does not support mixing ECC and non-ECC memory. Otherwise, the system will not boot the operating system. ✎ The memory count will be affected by configurations with the Management Engine (ME) enabled. The ME uses 8MB of system memory in single channel mode or 16 MB of memory in dual-channel mode to download, decompress, and execute the ME firmware for Out-of-Band (OOB), third-party data storage, and other management functions. Solving Memory Problems Problem Cause System will not boot or does not function properly after installing additional memory modules. A memory module is not installed in the XMM1 socket. Out of memory error. Memory count during POST is wrong. Insufficient memory error during operation. Memory module is not the correct type or speed grade for this system or the new memory module is not seated properly. Memory configuration may not be set up correctly. You have run out of memory to run the application. The memory modules may not be installed correctly. Integrated graphics may use system memory. Too many Terminate and Stay Resident programs (TSRs) are installed. You have run out of memory for the application. Solution Ensure that a memory module is installed in the black XMM1 socket on the system board. This socket must be populated with a memory module. Replace module with the correct industry-standard device for the computer. On some models, ECC and non-ECC memory modules cannot be mixed. Use the Device Manager to check memory configuration. Check the application documentation to determine the memory requirements. Check that the memory modules have been installed correctly and that proper modules are used. No action required. Delete any TSRs that you do not need. Check the memory requirements for the application or add more memory to the computer. Service Reference Guide, dc7700 433612-001 D-27