HT3964 I have an old Power PC iMac.  When I get the blue start up screen, I get a beach ball and then the computer quits

I have an old iMac (PPC).  When I now start up, I get to the blue screen, I get the beach ball, then the whole computer
shuts down, including the power.

Timesharing is back.  It's called cloud computing.
1) Try a safe boot.
     Shutdown your machine.  Hold down the shift key.  Poweron.  Wait awhile; wait awhile while you harddrive
     is being checked.
     http://support.apple.com/kb/ht1455
2) Another way to correct filesystem problems is into single use mode.
     This page will tell you how to get into single user mode.
     http://support.apple.com/kb/HT1492
    Basically, you hold down the command + s key then  powering on your machine. The command key
    has a little apple symbol on the lower left. It is between the alt/option key and the space bar. 
Here is a way of using an optical drive off of another mac.
You could try target disk mode if you have another mac around.
http://www.dan-taylor.com/reinstalling-mac-os-x-without-a-dvd-drive-target-disk- mode/

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