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Why does my Mac sound like rebooting without the chime?

After I boot-up or reboot my A1150, it keeps on making the reboot sound without the chime, i.e. the whirring/grinding noise. If I run my defrag programme it disappears. Very tedious!

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Depending on the age of your HD it may be failing or getting ready to fail. Keep a current backup, and check the SMART status of the drive.

Running Apple Hardware test may also provide some information.

Some anti-virus, or backup software can also cause a lot of drive reading/writing. Applications->Utilities->Activity Monitor may be able to identify which App is being active.

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Thanks, mach. I replaced the HD about 18 months ago as the original was just about at capacity. Current HD is 500 GB and only 10% used, BUT.........I took a tip which I might have read here, which said take the RAM chips, clean the contact strip and re-install in reverse order, i.e. move each chip into the other slot. Seems to work fine! Got to love these temperamental Macs!

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Could be your environment, humidity and dust can get inside these boxes fairly easily and over time you start to see some light corrosion causing problems.

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