DL360 G4 - 207 Invalid Memory Configuration

[Aaron Muñoz]

I tried to install an additional 1 GB DIMM of RAM in a DL360 G4 server but it halted during the POST process and returned this error message:

207 Invalid Memory Configuration
Single channel memory mode supports a single DIMM installed in DIMM socket 1. Please remove all other DIMMS or install memory in valid pairs. System halted.

I tried placing the DIMM in slot 2, slot 3, and slot 4, but none would allow the server to boot.

The existing RAM is HP branded but the new DIMM is Samsung branded. Could this be the issue? Are there other steps I can take before I buy an HP DIMM?