Can hear audio but get no video in QT player or iTunes or Safari

I can hear audio, but get no video (ie just a blank window or the "first frame" of the video) when playing basic ".mov" movies using QT Player. I also get the same behaviour when trying to watch movie previews in iTunes. I get the same behaviour when trying to watch QT movies in Safari (for example the latest apple advertisements from apple.com), although ironically I was able to watch the entire Macworld keynote without a hitch in QT Player?!?!
I know my mac is now "getting on", but I know it is still capable of displaying "ipod" sized movie trailers in iTunes.
Real player, cameraid, graphic converter and btv pro can all play the movies QT Player cant. Firefox can play the movies that Safari cant play. Unfortunately there isnt an alternative for iTunes.
Can anyone give any reason or solution to the fact that the core Apple applications are unable to play Apples own movie format when out of date, 5 year old, 3rd party software can?
I have tried
1) deleting the QT plist files
2) reinstalling flip4mac, perian, realplayer and flash, and
3) have just updated QT an iTunes to the latest version.
Any ideas?
The only hint I can think of, is that when playing a movie in QT Player, if you minimise the movie to the dock, and then bring it back to the desktop....it displays the "current" frame of the movie which sits there "frozen" until you do it again ... and just repeating, audio is fine.
The Plugins in my HD/Libary/Internet Plug-Ins folder are:
Flash Player.plugin
flashplayer.xpt
Flip4Mac WMV Plugin.plugin
Flip4Mac WMV Plugin.webplugin
Java Applet Plugin Enabler
Java Applet.plugin
JavaPluginCocoa.bundle
NP-PPC-Dir-Shockwave
nsIQTScriptablePlugin.xpt
Quartz Composer.webplugin
QuickTime Plugin.plugin
RealPlayer Plugin.plugin
VerifiedDownloadPlugin.plugin
Are any of these out of date?
Any help would be much appreciated.
Cheers,
Brad.

Yes Techmo, persistence is the secret.
After the QT 6.4.5 update once again made no difference, I gave up with a brand spanking new 2.8Ghz iMac only a couple of days away.
On cleaning out the old mac getting ready to transfer files to the new mac, I unplugged everything but (of course) power, keyboard and mouse.
I dont know why, but I tried a movie...and it worked like a charm.
I dont know what was plugged in that was giving QT grief, but I suspect it may have been my ageing Orange Micro iBot webcam. Too late now to find out (and I no longer care as I gaze on my new 24 inches of beautiful screen real estate), but for all those with this problem....try unplugging everything as I did and see what happens. At least it might be a starting point to solving your problem.
Strange it only affected Apples own applications though???

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