IMac 2008 emc 2211 suddenly turns off and back on, RAM problem?

I have an iMac from 2008 emc 2211.
Two years ago i upgraded my RAM from 2GB to 4GB Crucial memories.
Two weeks ago my imac started to suddenly turn off and back on inmediatly. Recently it stared to happen more often to the point that it can't boot completely and show the desktop
I checked the power source and it was fine.
I opened the computer and pulled out the power supply and it seamed to be fine.
I tried to run the hardware test with the disk that came with the computer and it can't even finish the test because it turns off.
Before it couldn't boot anymore i checked if it was overheathing with smcFanControl and the temperature was always around 44C, so it was fine.
Could this be the crucial RAM that is failing?
thanks in advance.

Ok, i've replaced the RAM and the power supply and the problem persist, so it seams to be the logic board that is failing.
Any ideas?

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