You should hear the boot chime sound again. When you hear the chime, immediately hold Option-Command-P-R (nvram/PRAM reset) Press enter, and you should again get an OK. You will get a text screen, showing a line that displays your firmware version on the iMac. I've searched for that IOHW, and have not found much.īoot holding Option-Command-O and F (that's a letter O, not a number zero. If you can boot to that hardware test, run both the normal, and extended tests. This link should work for that, if you don't have the version 2.5.3 hardware test for your old iMac. The hardware test CD for that IMac might work better for you, and should help you decide if your memory is OK. Or, if you made the bootable diagnostic disk correctly, you may have a problem with your Mac's memory, and it's not loading the diagnostic into RAM correctly (which could also be the cause for not booting to the normal system boot.) Works better than that CD, particularly if you have an original optical drive, which could simply have intermittent problems reading disks - due to age. I "restored" the disk image to a small partition on a hard drive. Did you try both, and only the one failed?)ĭid you burn that to a CD? Looks like it is missing the fonts to show the GUI for the diagnostics, which would certainly make it fail to set up the test. Which boot choice did you make? (There's two. So, you see - I suspect that you have a problem on the logic board, or could even be a failing (weak) power supply. It will explain in the file how to make the CD from the file. You might also see it listed as Apple Service Diagnostic (ASD) v.2.5.8 - or something similar. I didn't try the download to see if it actually links to something (Apple official downloads tend to get removed without warning) This link appears to download a large number of files, so you want to view the results, looking for Apple's file number, which is 693-5964-A.
That's the version you want for your G5 iMac. Scroll about 3/4 down the page for ASD-2.5.8.zip You have to find the download (disk image) that makes the CD, and I'm not sure where you could go to find that.
The CDs don't exist for sale sanywhere, as far as I know. I would run that on your iMac, if you can find the download for that ASD disk. ( - no, there's an internal power button near the upper fan, but no reset button on this model )īut, your iMac seems to function, with a working display, and you get to the desktop in Safe Boot mode?Īpple's Service Diagnostic (ASD version 2.5.8, IIRC.) has an "OSX boot" which tests how the hardware reacts to an operating system. Release the power button, then press the power button again to start up your iMac. SMC reset on your iMac ALC G5 is just unplugging everything from the back, wait 10 seconds, then plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
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