How To Run Memory Diagnostics May 2026

Blue Screen of Death (BSOD)

Running memory diagnostics helps identify faulty hardware causing system instability, such as the , random crashes, or file corruption. Both Windows and macOS include built-in tools to scan physical RAM for errors. Windows Memory Diagnostic

Every 6 months: Run the Windows Memory Diagnostic (quick pass) as part of routine maintenance.
After a power surge or outage: Power fluctuations can corrupt RAM cells.
After installing new RAM: Always run MemTest86 for 4 passes before assuming your new purchase works.
When buying a used PC: Run an overnight MemTest86 before handing over cash.

5. Replace the RAM

For Apple Silicon (M1, M2, M3) Macs

Command (⌘) + D

Press on your keyboard to start the diagnostics. For Intel-based Macs: Shut down your Mac. Turn it back on and immediately press and hold the D key . how to run memory diagnostics