I have the same symptom as Dr_Crowell on Jun 17, 2008, but the physical drive is brand new and in good working condition. I am able to partition it and journal it, but when I get to the 'select destination drive ' window during the OS install I either do not see the new disk or it is not selectable. Any ideas???
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Bad capacitors often cause the no-turn-on problem. This page has a good picture of what bad caps look like in the G5. If you see this trouble in your G5, you might be able to get this going. Kits of capacitors are available (here's the place I got some from) and If you're comfortable with electronic soldering and replacing parts on a printed circuit board, changing out the duds may be all that's needed. I've seen three of these now. On one, there was just a single bad cap that was keeping the computer from starting up. It's certainly worth looking into.
I have to assume that you mean you REPLACED the hard drive, as there is no room for two drives in an iMac.
If I had this machine in my shop, I would start by resetting the SMU (there are several models of iMac G5, each with a different procedure) and then resetting the PRAM at boot by holding down command-option-P-R until I got the boot chime three times. Then I would boot it from an external OS drive and run DiskWarrior over the internal drive to straighten out any file system corruption. Or, if the drive is brand new, I would erase and format it with "write zeroes to all records once" just to verify the drive and map out any bad blocks.
Then I would try the installation again. When the machine rebooted, I would hold down command-V as I heard the boot chime, just to watch the console messages in real time and see what appears at the point of hang, assuming it continues to hang. From that point, I would be able to diagnose more about where to look for the problem.
Thanks for the detailed report by the way. I apologize if my plan of action involves a lot of accessories you don't own, but the fact is you don't have a trivial problem to diagnose here.
Hello, Sorry to hear you are having troubles,
Is this a 17” iMac G5, if it is, and I think it is, unfortunately, this iMac model was generation 1 of the all in one flat screen design and it's a bit of a Lemon... The hard Drive overheats the video card and the power supply. With time, these 2 elements burn out.
What you have sounds like the power supply.
it's a $300 repair, but, it might not be a good investment for you, the new power supply won't last much more than the first one and your video chip won't last much longer....
Best put the money and put it towards a new machine.
Sorry bout that.