Can't install Mac OS X on iMac G5 20" 1.8

Discussion in 'PowerPC Macs' started by bms2sm, May 15, 2011.

  1. macrumors newbie

    Hi everyone, i wonder if I could get some help... I have an iMac G5 20" 1.8 which could not find the startup/ hard drive... I have bought a new hard drive but when booting up. It can only read the Install Disk and hard drive is nowhere to be found. I have reset the SMU and PRMU and had no luck at all. It started just a few days back and have used the hardware disk to verify everything, and the hard drive and logic board have all passed the tests. I don't know whether the disks are incorrect as I bought it from a friend who had all the packaging and disks. The manuals included state the Mac OS X is Panther but when it was still working, I noticed the version was 10.5 something... I would appreciate all your help as I have partitioned the disk on a macbook with all the correct options. Had to even remove the memory sticks with no joy.

    The diagnostic LED 1, 2 and 3 do light up, I don't know when the 4th one is due to light up.

    Would appreciate your help and many thanks in advance.
  2. macrumors 6502

    LEDs 1,2 and 3 lighting up is good. You do not want the 4th to light up as that means that your system is overheating and needs to cool down.
  3. macrumors 6502a

    What kind of HD is it? You may have to force it to a slower SATA bus speed for it to be recognized.
  4. macrumors newbie

    Hi, it's a WD HD, have tried to set it to 1.5 but still no luck
  5. macrumors newbie

    that's good then, but still can't install Mac OS X
  6. macrumors 6502a


    Some hard drives simply do not like to be recognized. I bought two Samsung 1TB HD103SJ's from different vendors. One worked, one didn't no matter what I did with the jumper settings. I got another one months later with the same chipset as the non working one, and it was visible in my PowerMac. They're just picky sometimes. Hopefully you don't need to buy a new hard drive in your case.
  7. macrumors 68040


    Is HDD visible under Disk utility? Did you check SATA cable if it isn't loose?
    Do you have another computer or at least external enclosure in which you could test this HDD?
  8. macrumors 6502


    Repartition the drive with Disk Utility making sure to use APM (the old Apple partition scheme) instead of MBR (the legacy Windows partition scheme) or GPT (the latest and greatest partition scheme). A PPC Mac will only recognize an APM for boot volumes. I learned this the hard way the first time I put an aftermarket drive in a Mac about 7 years ago.

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