HELP - Mac won't reboot after latest Apple patches!

Just came home and started doing some work when the software updates asked to install 4 or 5 patches for my Mac. I accepted and the install was done in less than 10 min. Time for a restart.
Well it did not come back after that. After the standard power on sound, the dark gray apple apears on light background and thats it. I have been waiting for some 15 min and nothing.
Did a hard shutdown (the only thing it would do) and a reboot into my secondary HD through an 'option' boot.
Checked the files system on the main hard drive with the disk tool: clean
Ran Disk Warrior: clean
Another attempt to reboot: same thing - it hangs with the Apple on the screen.
1.) HELP - what can I do to make my Mac boot again?
2.) If you run a mirrored door dual G4 1.25Ghz you might want to stay away from the latest Apple patches.
Thx!
Oliver

Hi, it maybe "too late" to ask now, but did you Repair Disk Permission before doing the updates, and after the (auto) restart, did you do another Repair Permission and then restart again?? And in this whole process of updating, especially Apple OS, Security Updates and Apps Updates, did you unplug all the external devices??
I know on the net some "schools" say there is no need to do this, and that you can run apps in the background and still do the Software Updates; I beg to differ, then you'll see lots of posts here asking for help, and at the same time cursing and swearing at Apple.
I just did my latest updates, and my iMac is running just fine.
So pardon me, and I apologise for nagging, but don't blame Apple or someone else when your mac acts up because you did not even prepare the basic procedures. Ask yourself this very simple question, if you are ill and taking medication, would you take it down with alcoholic drink?? Which may worsen your body situation?? Maybe it's not a very good example.
fxstein, sorry there, not here to lecture you or "tell you so", but am here to help, but I've just seen too many posts complaining of updates went wrong only to find out they did not do the necessary preparations.
If you can't boot from your problematic primary drive, try booting from your secondary, thank gosh you got one, and see if you can Repair Permission and also Repair Disk of the Primary Drive. Another way is to see if you can boot up from your OS disc and do the same, see if you can revive or repair your drive.
If still cannot, see if you can Safe Boot, (press Shift key) while booting, if you can, most likely some StartupItems may have been corrupted or something, the only thing you can do now is to backup your important data and then do an Archive and Install option.
Take care and Cheers

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