Take out all memory sticks except one, and try that one stick in each memory slot.
If it works, increase the voltage to the memory stick, save and power off.
Then add the other sticks.
Take out all memory sticks except one, and try that one stick in each memory slot.
If it works, increase the voltage to the memory stick, save and power off.
Then add the other sticks.
Take out all memory sticks except one, and try that one stick in each memory slot.
If it works, increase the voltage to the memory stick, save and power off.
Then add the other sticks.