I was configuring our twelfth virtual host this afternoon and ran across a weird issue.  You see, we buy IBM Blade servers that go through integration, which means someone else configures the hardware for us.  Unfortunately, I don’t think they turn the hardware on and check things.  Case in point: we had Blades with processors running two different microcode levels (think firmware for a processor).

Little did I know anything was wrong when I got a big fat blue STOP error.  MULTIPROCESSOR_CONFIGURATION_NOT_SUPPORTED was staring me in the face.

Remember, check your microcode levels if you see STOP 0x0000003E.  It could save your life.