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  1. #16
    Quote Originally Posted by Bob M. View Post
    I've read of firewalls but no idea what stealth mode is; probably time to haul out the textbooks.
    Bob M.
    Stealth mode basically makes your Mac "invisible" to the internet if someone is just scanning IP addresses and looking for open ports on your computer to access it.
    It came to mind when you mentioned that your Mac occasionally turns on by itself, however, it's pretty unlikely that somebody is doing that but it doesn't hurt to turn stealth mode on.
    That way if some one scans IP addresses, your Mac will not respond is "stealth" is activated thus making your Mac essentially "invisible".

    "Stealth is rurned on in the Firewall preferences under Firewall options.
    There is a brief description there what it does.

  2. #17
    Having trouble powering up my iMac
    pm-r's Avatar
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  3. #18
    Having trouble powering up my iMac
    pm-r's Avatar
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  4. #19
    Quote Originally Posted by pm-r View Post
    See:
    How to Enable Stealth Mode Firewall in Mac OS X
    How to Enable Stealth Mode in Mac OS X Firewall for Added Security
    This article also mentions that one might run into network problems with stealth mode activated. I have read this before.

    But I have had stealth mode activated for as long as I can remember - never had any network issues because of it.
    I suppose if I needed to log into my Mac remotely this might be a problem.
    Can anyone shed a bit more light on this, ie what problems could one encounter?
    Any internet activity I do, web browsing, FTP transfer, torrenting, email communications - all works fine.

  5. #20
    Having trouble powering up my iMac
    Randy B. Singer's Avatar
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    Feb 01, 2011
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    Quote Originally Posted by Bob M. View Post
    Hi all,

    I have an iMac late 2009, running Sierra 10.12.6 and I've been having trouble starting it up after I power it down.
    That symptom is typical of an old desktop Macintosh with a dead or dying PRAM battery. The PRAM (paramater RAM) battery is typically good for 5 to 7 years. Yours is well overdue to be replaced.

    The good news is that a new PRAM battery is really cheap, you can get them for two for $1 at any Dollar Tree store or for a bit more at a Walmart jewelry counter. It is commonly known as a
    Panasonic CR2032.

    The bad news is that on your model of iMac, while it isn't exactly hard to replace the PRAM battery, it is a bit involved. See:

    iMac Intel 27" EMC 2309 and 2374 Teardown - iFixit
    (step 21)
    Randy B. Singer
    Co-author of The Macintosh Bible (4th, 5th, and 6th editions)
    Mac OS X Routine Maintenance http://www.macattorney.com/ts.html

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