I rebooted after running security etc updates, now my old imac won't start up OSX. the wierd thing is that it asks me for user and password, which I enter, that is as far as I can get (Darwin/BSD console ). Any help would be appreciated!
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Does it give you an error of any sort? You might try booting with verbose output enabled, by holding Cmd-V at the chimes.
What happens if you type boot
I tried cmd-v and a bunch of text scrolled by. It appears there are some files missing ... hp.com, and other files that are not found. Any other ideas? I booted from my OSX disk (the upgrade one) and it says that my hard disk has a newer operating system on it, not sure why it thinks that! I just ran the Hardware Test Disk and the memory test failed. I got this error Mem_/4/7 the first time I tried it again and got Mem_/5/8 error the second time. Any idea what that means? I pulled the memory sticks out and re-inserted them and no change.
didn't work.
If you ran a system update (possibly including security updates, but definitely updating from, say, 10.4.4 to 10.4.5), then you are running a newer version of the OS, and it won't let you install a version that doesn't includes those updates over it. You can, however, run an archive-and-install (don't forget about the "preserve user and network settings" option!).