Red Light Flash

Discussion in 'Mac Pro' started by 3runjosh, May 24, 2009.

  1. 3runjosh macrumors member

    Joined:
    Dec 7, 2008
    #1
    Hi, I was starting up my mac pro this evening in a dark room and noticed a flash of red light for half a second upon pressing the power button. Being curious of this I shut down the computer took off the side panel and tried powering it up again. I saw 4 lights on Memory Riser B flash on for half a second then disappear. In System Profiler it shows all my ram is 'OK' but I have never witnessed this flash of red light before. Is this a normal thing to occur when powering up a Mac Pro late 08 model or should I contact Apple over this?
     
  2. surflordca macrumors 6502a

    surflordca

    Joined:
    Nov 16, 2007
    Location:
    Ontario, Canada
    #2
    I would think it is normal as mine does it also. I think it is just getting power before the computer reads the memory.
     
  3. djjclark macrumors regular

    Joined:
    Feb 17, 2008
    #3
    They are hardware error indicators. They default on when power is applied and are turned off once the memory controller/memory is validated. It is normal to see them flash on power up.
     

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