QuickTime & Security upgrades--system will not boot

Hello. I'm new to the posting/discussion board world, and while I have reviewed other threads I haven't found anything yet to solve my problem.
Let me say that I am not sure of the particular OS version I am using (10.4.8 is a guess). Since I tried to install the QT/security update last weekend, my iMac gets to a point where something (either the hardrive or the fan, or both) are making considerable noise. The machine sounds like it's trying to take off.
Having browsed some other threads, I have done these things:
I booted the computer using my system installation disk; ran Disk Utilities; repaired the disk; and verified disk permissions. Initially, the repair-disk function did not succeed, but I have run it again and it indicated success. I have fixed disk permissions and verified them, again apparently successfully.
When I attempt to boot, the gray screen comes up but after approximately one minute a circle appears where the Apple ought to be and the harddrive/fan ramps up to take-off speed. Out of fear for the system I do not let this condition continue for more than a few minutes and I turn the machine off by pressing the power button for several seconds. It seems clear that it won't boot.
I have not been able to boot into safe mode, either, if that means holding down the shift key upon power up.
I am now lost as to what I can do without attempting to re-install OS X from the disk or seeking other professional help. I sincerely appreciate any assistance in this matter.
Aaron Fultz
Ames, Iowa

BDAqua,
My deepest appreciation for your assistance. Your solution seems to have worked and the system appears to be running as before.
If I may ask two follow-up questions:
1. If I ensure that the disk permissions are repaired/verified, can/should I go ahead and update my system with the 10.4.11 update?
2. Do I maintain the "previous system" file on my harddisk, or can I safely delete it?
Thanks again for your help and guidance. It was rather upsetting having my computer disabled like that. I've definitely learned from this.
Aaron

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