It didn't say which stick, but it confirmed his fear. He downloaded a more specific tool called MemTest86. It pointed a finger at the second RAM slot. Leo powered down, removed the stick of RAM from slot A2, and restarted.
It didn’t fix the problem. But it gave Leo the one thing he desperately needed: a definitive answer that the problem was hardware, not software. And sometimes, knowing what the enemy is, is half the battle won. what does windows memory diagnostics tool check
By running the Windows Memory Diagnostics Tool, Leo had not just solved a crash; he had watched his computer run a full physical and a psychological exam on its own short-term memory. It checked for (Basic Matrix), neighbor interference (Walking Bit), data retention (Moving Inversions), random access stability (Stride), and communication integrity (Block Move). It didn't say which stick, but it confirmed his fear