Suddenly All Video Content Jerky and Slow

For unknown reasons, all videos I play on my iBook- from youtube to Letterman monologues or news clips - no longer play smoothly, but are either severely time delayed and jerky (though audio of videos is still smooth), or arrive as stills which change every few seconds as the video progresses.
Any idea what app, cache or preference I should dump, or what else I can do to fix this?
Thanks, PP
Message was edited by: PeterPaller
Message was edited by: PeterPaller

How long has it been doing this?
Very Important, how much Free Space is on your Hard Drive first of all? Click on the Macintosh HD on the Desktop, then do a Get Info on it.
At this point I think you should get Applejack...
http://www.macupdate.com/info.php/id/15667/applejack
After installing, reboot holding down CMD+s, (+s), then when the DOS like prompt shows, type in...
applejack AUTO
Then let it do all 5 of it's things.
At least it'll eliminate some questions if it doesn't fix it.
The 6 things it does are...
Correct any Disk problems.
Repair Permissions.
Clear out Cache Files.
Repair/check several plist files.
Dump the VM files for a fresh start.
Trash old Log files.
First reboot will be slower, sometimes 2 or 3 restarts will be required for full benefit... my guess is files relying upon other files relying upon other files!
Disconnect the USB cable from any UPS so the system doesn't shut down in the middle of the process.

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