3 long beeps, 2 short ones after installing new memory

[Rikerbabe]

Getting the 3 long and 2 short beeps...what can I do to correct this? I went back in to check and make sure everything was back in the right place and the memory was seated properly. Closed up the case and the same thing happens again... **AT MY WITS END!!*

[Prométhée]

Hello
I may not have understood correctly, have you tried to replace the original modules?
There are many different documents, it is difficult to find what exactly corresponds to certain models of computers, but it seems to correspond to this:

Hardware

3.2

The embedded controller has timed out waiting for BIOS to return from memory initialization.

Indicates potential memory failure. Reseat memory. Correct memory configuration (correct DIMM placement and size/type matching). Test with known good memory. Replace affected component.