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G5 Wont start up fans running high

331 Views 9 Replies Latest reply: Jul 2, 2013 11:13 AM by BDAqua RSS
joybird Calculating status...
Currently Being Moderated
Jun 30, 2013 12:15 PM

HI.  I have a G5 and I just installed more ram.  Everything was fine until I hooked up my firewire back up drive and the whole system froze.  Now when I try to start the computer all I get are fans spinning out of control.  I have reset the SMU twice to no avail.  I took out the Ram I installed that I got from Crucial, thinking it might be bad, and would just put the system back to the way it was cuz there was Nothing wrong with it before I installed this ram.  Now, I have a mess.  Any suggestions?

 

Jbmmusic

Imac and Powermac G5, Mac OS X (10.4.11)
  • BDAqua Level 10 Level 10 (114,775 points)
    Currently Being Moderated
    Jun 30, 2013 3:42 PM (in response to joybird)

    Hello,

     

    For safety, anytime the OS can't load the fans go on high.

     

    Any light on the monitot?

     

    Is the power button flashing?

     

    Have you done a PRAM reset, CMD+Option+p+r...

     

    http://support.apple.com/kb/HT1379

     

    In fact, do 3 in a row, takes a bit of time.

     

    Does it boot to Single User Mode, CMD+s keys at bootup, if so try...

     

    /sbin/fsck -fy

     

    Repeat until it shows no errors fixed.

     

    (Space between fsck AND -fy important).

     

    Resolve startup issues and perform disk maintenance with Disk Utility and fsck...

     

    http://docs.info.apple.com/article.html?artnum=106214

  • BDAqua Level 10 Level 10 (114,775 points)
    Currently Being Moderated
    Jul 1, 2013 2:49 PM (in response to BDAqua)

    .

  • BDAqua Level 10 Level 10 (114,775 points)
    Currently Being Moderated
    Jul 1, 2013 2:48 PM (in response to joybird)

    Good work!

     

    Need more info to answer the rest...

     

    At the Apple Icon at top left>About this Mac.

     

    Then click on More Info>Hardware and report this upto *but not including the Serial#*...

     

    Hardware Overview:

     

    Machine Name: Power Mac G5 Quad

    Machine Model: PowerMac11,2

    CPU Type: PowerPC G5 (1.1)

    Number Of CPUs: 4

    CPU Speed: 2.5 GHz

    L2 Cache (per CPU): 1 MB

    Memory: 10 GB

    Bus Speed: 1.25 GHz

    Boot ROM Version: 5.2.7f1

  • salmonmouth Calculating status...
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    Jul 1, 2013 5:39 PM (in response to joybird)

    I'm having a similar problem, but with an interesting twist.  I've been searching discussions to see anything that might relate to this.  A couple of days ago my G5 (2.5 - LCS) started to fail during start-up.  Power light on tower came on, sounds of start-up, but no image on display.  I opened up the case, did some cleaning and tried again.  Got the gray apple to appear but no spinner; just stayed on the gray apple image.  Shut down, did some more cleaning, specifically shop vacuumed along the radiator of the LCS.  Turned it on and the operating system loaded completely.  Turned it off and turned it on again and no image.  Tried the shop vac again on the radiator, and the system loads just fine.  So whennever I want to use the G5, I have to go into the case and hold the hose of the shop vac on the radiator for a minute.  I fear my processors are getting old and weary and are not functioning well in the heat.  But if anyone has another theory, I'd like to hear it.  In the meantime, I am going to attempt replacing the processors and LCS.  But for anyone experiencing the "tower on, no picture" phenomenon, I encourage you to try the manual cooling process of holding a shop vac to the radiator inside the case for a minute and see if you have similar results. BTW - I tried to hold shop vac hose to exhaust ports on backside of case - It did not do the trick.

  • BDAqua Level 10 Level 10 (114,775 points)
    Currently Being Moderated
    Jul 2, 2013 11:01 AM (in response to joybird)

    Sometimes faster RAM will run a slower speeds, but yes, & the only speed the G5 will run at is PC2-4200, 533MHz, & needs matched oposing pairs...

     

    4-3-2-1*1-2-3-4

     

    One with one, 2 with 2, etc.

     

    DIMM0/J6700:

     

      Size:    1 GB

      Type:    DDR2 SDRAM

      Speed:    PC2-4200U-444

      Status:    OK

      Manufacturer:    Unknown

      Part Number:    Unknown

      Serial Number:    Unknown

     

    DIMM1/J6800:

     

      Size:    1 GB

      Type:    DDR2 SDRAM

      Speed:    PC2-4200U-444

      Status:    OK

      Manufacturer:    Unknown

      Part Number:    Unknown

      Serial Number:    Unknown

     

    DIMM2/J6900:

     

      Size:    2 GB

      Type:    DDR2 SDRAM

      Speed:    PC2-4200U-444

      Status:    OK

      Manufacturer:    Unknown

      Part Number:    Unknown

      Serial Number:    Unknown

     

    DIMM3/J7000:

     

      Size:    2 GB

      Type:    DDR2 SDRAM

      Speed:    PC2-4200U-444

      Status:    OK

      Manufacturer:    Unknown

      Part Number:    Unknown

      Serial Number:    Unknown

     

    DIMM4/J7100:

     

      Size:    2 GB

      Type:    DDR2 SDRAM

      Speed:    PC2-4200U-444

      Status:    OK

      Manufacturer:    Unknown

      Part Number:    Unknown

      Serial Number:    Unknown

     

    DIMM5/J7200:

     

      Size:    2 GB

      Type:    DDR2 SDRAM

      Speed:    PC2-4200U-444

      Status:    OK

      Manufacturer:    Unknown

      Part Number:    Unknown

      Serial Number:    Unknown

     

    DIMM6/J7300:

     

      Size:    Empty

      Type:    Empty

      Speed:    Empty

      Status:    Empty

      Manufacturer:    Empty

      Part Number:    Empty

      Serial Number:    Empty

     

    DIMM7/J7400:

     

      Size:    Empty

      Type:    Empty

      Speed:    Empty

      Status:    Empty

      Manufacturer:    Empty

      Part Number:    Empty

      Serial Number:    Empty

     

    http://eshop.macsales.com/MyOWC/Upgrades.cfm?sort=pop&model=234&type=Memory

  • BDAqua Level 10 Level 10 (114,775 points)
    Currently Being Moderated
    Jul 2, 2013 11:13 AM (in response to salmonmouth)

    Hello, just to mention, you can feel free to start a new topic to likely get more help on your particular issue.

     

    I doubt a vacumm will remove enough dust, I use a 100psi Compressor to blow the dust out.

     

    Also, your coolant may need replacing, & the thermal paste on the CPUs likely needs replacing, also pay attention to the dust on the Video card, & the fan on it if it has one.

     

    Does it start better if allowed to cool?

     

    Get Temperature Monitor to see if it's heat related...

     

    http://www.macupdate.com/info.php/id/12381/temperature-monitor

     

    Might be time to replace the PRAM Battery, 4 years is close to their lifespan, far less if ever without AC power, & can cause strange startup problems...

     

    See which one your G5 has...

     

    http://eshop.macsales.com/item/Newer%20Technology/CR2032/ 

     

    http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/

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