HP ProDesk 400 G1 Maintenance And Service Manual page 191

NOTE:
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 16MB 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.
System will not boot or does not function properly after installing additional memory modules.
Cause
A memory module is not installed in the DIMM1 or XMM1
socket.
Memory module is not the correct type or speed grade for the
system or the new memory module is not seated properly.
Out of memory error.
Cause
You have run out of memory to run the application.
Memory count during POST is wrong.
Cause
The memory modules may not be installed correctly.
Integrated graphics may use system memory.
Insufficient memory error during operation.
Cause
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 DIMM1 or
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.
Solution
Check the application documentation to determine the
memory requirements.
Solution
Check that the memory modules have been installed correctly
and that proper modules are used.
No action required.
Solution
Delete any TSRs that you do not need.
Check the memory requirements for the application or add
more memory to the computer.
Solving memory problems
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