If you suspect your Mac machine might have a hardware failure, you can use the bundled Apple Hardware Test that came with your Mac to do a diagnostics.
Apple Hardware Test is a diagnostic tool for detecting issues with your computer’s internal hardware components such as the logic board, memory, modem, video RAM, and Apple’s AirPort card. It does not check externally connected hardware components such as USB drives or Firewire devices; it does not check non-Apple devices such as PCI cards from other vendors.
Apple Hardware Test does not check your computer for issues with the Operating System (OS) or other software related issues such as application or extension conflicts. Continue reading