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Daniele BrunengoFlag for Italy

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Mac Mini hanging a few minutes after logon

Hello, so I have this customer's Mac Mini which just hangs 4-5 minutes after logon.
The dreaded Apple coloured pin wheel starts rotating and the system becomes unresponsive.

I can click here and there, but nothing happens although part of the interface still looks "alive".
Top menus mostly respond to mouse clicks, but nothing happens, not even if I try to shut down the machine.

So I'm no Mac expert, I fix hundreds of Windows PCs each year and I'm a Linux lover, but I rarely dabble with Apple stuff.

I booted to the hardware test utility, did the full test but it found no problems.

So I was wondering, what would be the best course of action here? I googled this quite a lot but found nothing conclusive, except for a lot of people with the same problem saying they never fixed it.

Maybe rolling back to an older version of OSX can help?

It's a Mac Mini version 6,2 (late 2012).

The OSX version is 10.9.5 (Mavericks).
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strung
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Open Activity Monitor (found in /Applications/Utilities). Click on one of the column headings to sort the list by %CPU. See what process is hogging the CPU when the spinning ball comes up. Report back here with the information.
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David Anders
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Thanks for the webpage link. I downloaded the smart utility and it looks like the hard drive has thousands of damaged sectors. Amazingly, I managed to finish a Time Machine backup anyway.

So now I'm waiting for the new drive.

I'll need to reinstall OSX. The Time Machine backup should recover everything, including installed apps right?
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Yes, TIme machine should recover everything that was backed up to it.
Substituting the hard drive and recovering the Time Machine backup fixed everything, after some small additional troubleshooting.
Thanks a lot.
It was the hard drive. The deed is done.