Michael Kenny
Level 1 (5 points)

Q: My power mac G5 won't boot up but has red flashing light and intense fan noise.

I Have a Power Mac G5 that flashes a red light that I've never seen before. There is nothing on the monitor and the fan noise is incredible.

HAs anyone ever had this problem?

G5 Dual 2.7 3.5 Gig of ram

Posted on Jul 4, 2013 1:20 PM

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Michael Kenny

Q: My power mac G5 won't boot up but has red flashing light and intense fan noise.

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  • by BDAqua,

    BDAqua BDAqua Jul 5, 2013 11:05 AM in response to Michael Kenny
    Level 10 (123,780 points)
    Jul 5, 2013 11:05 AM in response to Michael Kenny

    Hi Michael,

     

    It's normal for the fans to go full speed if the OS won't load to handle them.

     

    Where is this red light, on the logic board, or front panel?

     

    Can you count the beeps or flashes?

     

    1 beep = no RAM installed

    2 beeps = incompatible RAM types

    3 beeps = no good banks

    4 beeps = no good boot images in the boot ROM (and/or bad sys config block)

    5 beeps = processor is not usable

     

    In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.

     

    Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length.

     

    http://support.apple.com/kb/HT1547

     

    LED 1—CPU A:  red—contact Apple or an Apple Authorized Service Provider

    LED 2—Overtemp:  red—contact Apple or an Apple Authorized Service Provider

    LED 3—Power On:  red—the main power is on

    LED 4—Trickle:  yellow—Power Mac G5 is plugged into the wall correctly

    LED 5—Open Firmware good:  green—no problem

    LED 6—CPU B:  red—contact Apple or an Apple Authorized Service Provider

    LED 7—Checkstop:  red—contact Apple or an Apple Authorized Service Provider