Stuck in restart after tiger installation

my g4 has been stuck in restart for 30 minutes since it finished installing tiger. what do i do?? i cant get it to do anything....

OK, what is this "CheckUpAgent" application? It isn't part of OS X, so I'm guessing you have it as a StartupItem. Tricky
You will need to look in several places to find this and disable it. I am assuming the application has been updated to use launchd, since there is no mention of SystemStarter. So you need to look in four places:
"/System/Library/LaunchAgents"
"/System/Library/LaunchDaemons"
"/Library/LaunchAgents"
"/Library/LaunchDaemons"
If the developer of "CheckUpAgent" has played by the rules, it should be one of the last two. The file you are looking for should be called something like com.app4mac.CheckUpAgent.plist, although they may have left off the "com.app4mac".
Now, to do this we must mount the disk to be writable, so after you have booted and run fsck -fy again, type this carefully !
/sbin/mount -uw /Notice the space before the hyphen and before the '/'. Then we'll look at these directories:
cd /Library/LaunchAgents
ls -lIf you don't see the file there, then
cd /Library/LaunchDaemons
ls -land so on.
When you do find it, then we'll temporarily move it to the top level of your hard disk:
mv com.app4mac.CheckUpAgent.plist /but change the name according to what you find.
Having done that, a
rebootshould allow you to try a normal boot again.
Make a note of any unexpected messages you see. Also if you do find the file write down the complete line from the ls -l command that shows it, since that will also show its ownership and permissions.
Good luck!

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