Just did a software update and now my mac won't boot

On Monday I did my Apple update, and when I tried to reboot after the update I was greeted with a circle with a line through it. I still get the moving circle on the bottom, but it never boots.
I do not have my original install disc, but I was able to use another G4 install disc to repair disk permissions and repair the disc. After doing so, I still have the same issue.
Any ideas would be really helpful. Thanks

Since Disk Utility can see your drive that is at least a good thing. I am just trying to establish where you stand on booting. Normally if you can boot but experience problems then you can try Disk Utility to repair the drive, which obviously doesn't work in your case. Next is Safe mode which starts up pretty much normally but bypasses some things, and that too is not working. Single User Mode takes you to a text presentation boot stage.
Once one starts with the stronger medicine it is a good idea to back up your data files at least in case the things you do make the drive worse. Booting into TDM makes your computer act like a giant external hard drive and gives you the chance to copy off those files, assuming your friend has the room on her computer. Then you're more at liberty to experiment with different things to get your computer up and working again. If nothing works you always have the option of reinstalling OSX. You might consider an archive and install, or if you can copy your files off elsewhere just reformat the drive and do a clean install and rebuild everything.
It may be a case where you may have to buy a utility like Diskwarrior which does things like Disk Utility repair but much more. Or if Diskwarrior doesn't work and you do need your files you may have to let a program like Data Rescue II have a go at recovering the files (but will need an empty harddrive at least the size of the data on your computer).
At this stage you might also start looking at external bootable hard drives, both because it might come in handy now and also because you'll be able to backup your computer in the future in case of a repeat occurrence.

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