OSX TIGER HEADACHES - DID LIFE BEGIN IN 76?

Hello,
I thought I had better start by mentioning that my first job was actually operating an Apple II Plus back in 82... what a beast.
Things have moved on a little since... anyway to my problems which are with a
Powerbook G4 1.5ghz 1.25 gig ram running OS X 10.4.11.
These are just a few....
1. Spotlight not working with external hard drives attached via firewire, won't re-index even with Spotless.
2. Very slow system, constant spinning wheel when accessing files, constant finder freezes.
3. Mouse misbehaving, slow erratic.
4. TOO Many console errors.
6. Security system not working well
7. when looking into activity monitor mds root file using 50- 88% of CPU most of the time!
8. Bad file creation dates in system (1 April 1976!)
9. Fan constantly running. processor hot even when no apps are running.
10. external hard rives behaving erratically.
Basically my machine is not very well, logic board was replaced a few months back.
Diskwarrior is not sorting the problems.
Absolutely any advice, except the usual 'Why don't you reinstall the system' will be most welcome.
So far this is what I have found out...
I have been trawling through various Mac forums and some of the very interesting information has led me to several conclusions.
My first is that Apple are playing games with us all... then I read on... maybe not?
Trying to fix start up errors (very big list) led me to look into the SYSTEM folder, which has a creation date of 1 April 1976??
Now I am not sure this will effect the system, but I am pretty sure it's going to do something bad. I'm running Tiger on another G4 tower which has the correct creation dates.. sometime in 2005, this runs well no problems like these.
Anyway I trawled away and found this...
'A BETTER FINDER TOOL SUITE' they say it can fix creation dates, but I am a worried what this may do....
A Better Finder Attributes 4 for Mac OS X: Features (http://www.publicspace.net/ABetterFinderAttributes/features.html)
I've not yet tinkered with the creation dates of the System as I wanted to ask here if anyone knew of this problem and any advice they can give (please no archive and install again!)
The funny thing about it is that the 1st April 1976 is the date Apple was founded. (Fishy)
Thanks for reading
Ian

Hi Antonio,
thanks for getting in here.
I suppose I must confess this was a reclaimed logic board, but it came from a very reliable source have no doubt.
I am certain that this is not the problem and it is software related.
Since my original post I have been working very hard to stabilize the machine and have succeeded on most counts.
1.Spotlight repaired and indexed normally at last ('Spotless' came through... eventually)
2. Fan no longer running constantly as indexing has been stopped on Firewire drives.
3. Ram was good and purchased from a very reliable company have no doubt, that has been fine for more than 2 years I am sure it's not the issue!
4. Internet Cleanup was causing many of the security issues and failures, I will be touch with SMITHMICRO, but rarely do they respond...(will post)
5. when looking in Activity Monitor 'mds root' has now calmed down to no activity and was related only to the Spotlight madness.
My only worry now is the 'Creation Date' in the 'System', but as I mentioned I can correct this for $20 by using - 'A Better Finder Attributes 4'.
I would like to understand where this date is coming from this is OSX not OS9??
If I were to re-install a system that has many mods, I will looses them, plus re-installing from 3 year old disks in a Powerwook with a susspect Superdrive is not an option for me.
thanks
Ian

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    Most of the time a perception of general slow performance is the result of installing third party junk alleged to speed up, "clean" or "optimize" your Mac, or to look for viruses that don't exist. Ideally you would know what you installed so you can uninstall it, but if you don't know or aren't sure there are techniques such as Safe Mode and creating a temporary user account to confirm that suspicion.
    If you open Activity Monitor it may show a process, or processes, that occupy a lot of your system's time.
    Slowness confined solely to web browser activity is often the result of an inexorable progress toward websites that demand ever more processor-intensive tasks. If your slow performance is strictly limited to web browsing, you might try disabling Flash by either uninstalling it, or use utilities such as ClickToFlash that allow you to control what Flash content gets loaded. Flash in itself is not inherently evil, but there is nothing to stop websites or the advertisers who pay for them from writing horrible Flash code that can do everything from hogging 100% of your CPU's time to causing random crashes. You can watch Activity Monitor as in the above to correlate these troublesome web pages with performance degradation.
    You are correct; if your computer shipped with Tiger you may certainly revert to it. I forgot that Tiger was shipping on new Macs as recently as five years ago. To downgrade it would be necessary to completely erase your hard disk and boot with the Tiger installation DVD, followed by installing it anew. Such drastic measures are not necessary and you are unlikely to be satisfied with the results anyway.
    Assuming your system is free of third party parasitic junk attached to OS X in an ill-conceived attempt to improve upon it, that your hard disk drive is sound and the boot volume has enough free space to work with, by far the best performance-enhancing improvement would be to add more memory. Buy as much as your computer can use and that you can afford. 2 GB is not that much any more.
    Read the following for some recommended troubleshooting techniques from Apple:
    General purpose Mac troubleshooting guide: Isolating issues in Mac OS X
    Creating a temporary user to isolate user-specific problems: Isolating an issue by using another user account
    Memory limitations: Using Activity Monitor to read System Memory and determine how much RAM is being used
    Identifying resource hogs and other tips: Runaway applications can shorten battery runtime
    Starting the computer in "safe mode": Mac OS X: What is Safe Boot, Safe Mode?

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