I want to upgrade memory on an old MCS-7815 server to run CCM 4.1.3 as a lab server. The server has a 2.0 GHz processor and 512Mb RAM. When I add an additional 512 DIMM, it won't boot. I hear a series of 3 beeps, 3 times in a row when I turn on the power, and it won't even get to the BIOS screen.
Both memory cards are good, I can boot with either one. I can also boot with memory in either the DIMM-1 or DIMM-2 slot, so I don't think it's a motherboard failure.
I looked up the 3x3 beep code on IBM's manual for the x205 server, it says I need to do a "3 boot reset", but it doesn't explain what a 3 boot reset is. I have gone into BIOS setup and reset memory, and tried rebooting in several different combinations.
Has anyone ever run into this? This server is supposed to support up to 2 Gb of RAM in a 2x1Gb combo, so I would expect it to support 2x512Mb.