Jerry Waldman
Level 1 (4 points)
Desktops

Q: Mac Pro (early 2008) blinking(1 /sec.) status LED; wont boot.

Mac Pro (early 2008) OS X, 10.11.6. tried waking from sleep and got blinking(2 per sec.) status LED; no other response. Forced quit. Wont boot. Just blinking status LED on front panel and fan sound. no bong. Tried pulling AC to reset SMC:

no change.

OBS Mac Pro (Early 2008), OS X El Capitan (10.11.6), wont boot; blinking status LED

Posted on Sep 30, 2016 3:48 PM

by The Kwamster,Solvedanswer
The Kwamster The Kwamster
Level 3 (809 points)
Mac OS X
A:

2 per second means there's something wrong with the RAM, or not enough of it is working to get through startup. Pull and reseat each stick -- one or more might be defective.

Posted on Sep 30, 2016 6:45 PM

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Jerry Waldman

Q: Mac Pro (early 2008) blinking(1 /sec.) status LED; wont boot.

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  • by The Kwamster,Solvedanswer

    The Kwamster The Kwamster Sep 30, 2016 6:45 PM in response to Jerry Waldman
    Level 3 (809 points)
    Mac OS X
    Sep 30, 2016 6:45 PM in response to Jerry Waldman

    2 per second means there's something wrong with the RAM, or not enough of it is working to get through startup. Pull and reseat each stick -- one or more might be defective.

  • by Jerry Waldman,Helpful

    Jerry Waldman Jerry Waldman Oct 4, 2016 11:45 PM in response to The Kwamster
    Level 1 (4 points)
    Desktops
    Oct 4, 2016 11:45 PM in response to The Kwamster

    Thanks for responding. I Pulled all the RAM (8 x 2GB, third party- sold as Apple compliant matched pairs) and replaced it with the original Apple-supplied (2 x 1GB) RAM. The Mac Pro booted normally. I started repopulating the 2 memory boards with the removed RAM DIMMs by pairs, booting after each addition, until the blinking light returned and the Mac wouldn't start. Removed last added pair and normal boot returned. Replaced that pair with another: normal boot.

    Definitely bad RAM.