Why doesn't "safe mode" startup work with my iMac G5

I wanted to start up in "safe mode" but could get no further than the revolving gears under the Apple logo. My procedure: I pushed the power button, and as soon as I heard the startup chime I depressed the shift key on my keyboard and held it down. Instead of getting a blue screen I got nothing but the continuously revolving gears. Releasing the shift key at that point didn't do anything. I held the power button until the computer shut down and then restarted, this time without depressing the shift key. This resulted in a successful startup. But why couldn't I start in safe mode?
iMac G5   Mac OS X (10.4.6)   1.5G of RAM

Hi bruckner,
How long did you wait for? Safe Mode startups can take quite a while because the process checks and repairs the directories. See http://docs.info.apple.com/article.html?artnum=107394
Think about how long it can take to run DiskUtility to run "repair Disk" when booted from your OS DVD, especially if there are any problems or you have a lot of files on the disk. The process is essentially the same. It could easily take ten minutes or more in some circumstances if it has to do any repair work.
If you are confident that you waited long enough, then make sure that you have all peripherals except for your keyboard and mouse disconnected. They may be interfering with the boot process when their drivers are not present.
(You can release the "Shift" key as soon as the gears appear)
Cheers
Rod

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