|Run memtest86+ overnight. |
Have you checked CPU & system temperatures?
You have a bottom mounted case. I am not a fan of those because heat rises and top mounted PSUs help dissipate the heat. In your can there is a number of opens and fans that could be causing one or more components to overheat.
I suggest you install HWMonitor and then monitor the temperatures and voltages in real time. Get HWMonitor at the link below.
Error 41 is classified as an error of unknown origin generated when the system has been shut down unexpectedly.
Your processor may be shutting down the system to protect itself. Did you apply thermal paste/pas properly and use an approved Heatsink/fan?