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Message: <blockquote data-quote="rachalmers" data-source="post: 1823943" data-attributes="member: 402263">I know this. It’s the hard drive parking. Some drives have built in sleep mode on the drive. It’s not to do with the computer, just the drive.Now. When the drive wakes up... it proceeds, but when parking again... snap.I’m not sure if it’s damaging the drive and you can get a bit of software that stops it. Overrides the drive code.It’s a ‘feature’ of some drives. Not all.I got rid of mine in the end. Didn’t want a failed drive in the middle of somethingBut... with no hdd, it sounds like a capacitor discharge. And they are not just on the main board, but the power supply is the main culprit.Sent from my iPhone using Mac-Forums</blockquote>