-
×InformationNeed Windows 11 help?Check documents on compatibility, FAQs, upgrade information and available fixes.
Windows 11 Support Center. -
-
×InformationNeed Windows 11 help?Check documents on compatibility, FAQs, upgrade information and available fixes.
Windows 11 Support Center. -
- HP Community
- Desktops
- Business PCs, Workstations and Point of Sale Systems
- 942-Memory Training Error (code 301c) after turn on

Create an account on the HP Community to personalize your profile and ask a question
03-21-2018 10:50 AM
Greetings, dear community members.
Some time ago I started getting the following error during power-on check.
I haven't ever removed either CPU or RAM units from the motherboard.
Could you suggest a troubleshooting please?
Thank you very much in advance.
Solved! Go to Solution.
Accepted Solutions
03-22-2018 04:45 AM - edited 03-22-2018 04:52 AM
try looking on the inside of the side cover, the user service manual, or use google to see the memory placement
if the error message follows the location of the ram swap the ram module is bad
if the error stays at the same memory location, either the cpu or the motherboard is at fault
in your case the error location changed to the socket that the suspect ram was installed so it's obvious the module is
failing replace it the reasion the windows mem diag tool does not see it is because thes workstations have the ability to
map out failing/failed ram on boot.
when the bios tests the ram, and finds a bad module, it simply alerts you and then removes the ram from the available ram pool total of available ram.
information like this is found in the user and service manuals for the z820 RTFM!!! do so will make you understand a lot more about your system!
03-21-2018 05:26 PM
reseat ram module in the slot that is giving you the error.
if the error persists swap ram with another ram module of the same size
if still getting error in new socket after swap memory module is going bad, replace module
03-22-2018 12:40 AM
Oh, I found white labels in the vicinity of the RAM modules
I swapped DIMM 3 with DIMM 4 on CPU and got the following error:
DIMM 4 on CPU 1 experienced an error during training (CODE 301c)
This means that system does not like RAM module currently installed in DIMM 4 on CPU 1.
On the other hand I left the workstation with Windows Memory Diagnostic Tool with Extended test and got no errors (see below).
How should I interpret this: bad RAM module or something else?
Thank you.
03-22-2018 04:45 AM - edited 03-22-2018 04:52 AM
try looking on the inside of the side cover, the user service manual, or use google to see the memory placement
if the error message follows the location of the ram swap the ram module is bad
if the error stays at the same memory location, either the cpu or the motherboard is at fault
in your case the error location changed to the socket that the suspect ram was installed so it's obvious the module is
failing replace it the reasion the windows mem diag tool does not see it is because thes workstations have the ability to
map out failing/failed ram on boot.
when the bios tests the ram, and finds a bad module, it simply alerts you and then removes the ram from the available ram pool total of available ram.
information like this is found in the user and service manuals for the z820 RTFM!!! do so will make you understand a lot more about your system!