You can relaunch Finder by force quitting it Command-Option-Escape
You reset Finder/Sidebar prefs by trashing the pref files, you can find them in ~/Library/Preferences/ (probably named com.apple.finder.plist & com.apple.sidebarlists.plist)
Logging out and back in may also help if you haven't...
Ah, I see. You can convert .aiff to .wav also In iTunes
OS Xs' system sounds are in /System/Library/Sounds if you want to use those (remember to make a copy, don't convert the original). And probably the easiest way to search what audio files are on your hdd is to do a Spotlight search with...
Right click on the Thunderbird app icon and choose 'Show Package Contents', then in contents there'll be a 'Resources' folder, go into that and have dig around, the aiff files will most likely be in there or possibly in 'English.lproj' or whatever your native language is. If you replace a sound...
1. USB hubs are fine to use, make sure it's USB 2.0
2. SuperDuper or CarbonCopyCloner
3. Don't know much about it, but check out Cha-Ching
4. For syncing files and folders? Check out Rsync for the involved way or ChronoSync for the easier way.
5. Yes. Though note if it is formatted in NTFS you...
When using the Sansui LCD TV/DVD, did you have it set up through System Prefs > Displays to have the Menu Bar on the external display? If so, this could be the problem, the Powerbook would be starting up ok, you just can not see anything. Start up with the external display plugged in, then go...
Mmm, have you tried deleting the preference files for those apps? Located in ~/Library/Preferences or /Library/Preferences
Maybe it's some keychain issue though? Check through Keychain Help to see if you can solve your problem through that.
Seeing as nothing is on the drive, no need to erase it, right? You can rename it (and format) via the 'Partition' tab. If I understand right, you just need to give the hdd a name.