Hi. My computer has lately been crashing or "powering down" by itself. Many people I've asked say either the vents are clogged with dust or the processor is weak due to overuse. I know it isn't dust because I opened up the laptop and made sure everything was clean. It still crashed so I think it was the weak processor. A message shows up that says something like "System OS checksum-bad-default configuration used". What does this mean?