What's the Difference Between Logic Board Failure and Hard Drive Failure

Hi!
So I wanted to know the difference between a Logic Board Failure and Hard Drive Failure because a couple of days ago I tried starting my computer up and I was welcomed by the Apple chime and a grey screen. I have been researching and most people say its either the hard drive or the logic board. So I am curious to know what are the symptoms of both. Thanks a lot, in advance!

The hard drive is where the OS resides, if it dies there is no OS loading, so you can't boot. If you hook up your external drive with your clone of the internal drive, boot up and hold down the option key, select your clone drive as the startup drive in boot manager that then appears, and the computer boots normally, then the computer is OK, it is just the internal drive that has gone south. You don't have a clone to boot from? Now you know why you should.
You could try booting from the DVD that came with the computer, hold down the "D" key to run diagnostics and see what the results are. If you can't boot into the diagnostics then a trip to the Apple store is probably in order.
Francine
Francine
Schwieder

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