... I have an iMac G5. I wasn't aware of the left mouse button. Dose the left mouse start up the hard drive. The special start up key strokes/commands won't work. I even tried restarting while pushing the eject key, this should normally eject the disk. I did get disk utilities to work twice, it seemed to get worse the more key commands I tried to start up with. ... My best guess is that the hard drive is a goner. Can anyone recommend where I can get a good/cheep drive?...
Left mouse button is just the normal mouse button, and does nothing unusual, except that it will eject an optical disk, if one is still in the drive at boot. You just have to hold the left button from the time you hear the boot chime sound. That has no effect on the hard drive... Why would you ask that question?
Yes, a mostly dead hard drive might interfere with booting to any disk or external hard drives, etc.
Which iMac G5 do you have? If it has the front bezel isight camera, it's quite challenging to replace the hard drive. The older iMac G5 (no camera) are very simple to open the back, and remove the hard drive. You can probably replace the hard drive in less than 2 minutes, if you have everything you need. The iSight iMac, on the other hand, likely would need at least 20 minutes - if you know where all the screws are, and have the right tools, mostly because the LCD panel has to come out.
If yours is the easy, older G5, (3 screws on the bottom edge, then lift off the back cover. The screws just loosen, don't try to remove completely.) then you can unplug, or just remove the hard drive, probably boot to anything you like then.
If you don't really have a local shop where you shop for "cheap stuff), then I would look on
Amazon for hard drives. Or, your favorite place to make purchases on the net.