Computer can't find digital camera

Computer can't find digital cameras-but can find scanner with same firewire port????? Anyone ever had this problem? What could it be? Have tried eveything I can think of. Won't capture with imovie either???? Has always worked fine in the past.
Help please.
Running OS X.4.6
FCP Studio 5.0.4
Quicktime 7.0.4
Camera Canon XL2
Sony Deck DSR-11

Recently upgrade your version of Quicktime or your OS?

#30 - Deck recognition after Tiger Upgrade:

Shane's Stock Answer #30:

[discussions.apple.com]

The credit for this goes to Bob Sidebotham:

I was just walked through a repair procedure by an Apple Care person, and it fixed my camera recognition problems (I have a Canon XL1 and sometime after installing Tiger, then 10.4.1, various patches (including Quicktime 7.1) and the latest Desktop Video patch, I've been unable to use the camera with Final Cut Express, and attempts to capture would result in a FCE crash).

The workaround is to download Quicktime *manually*, after removing the "receipts" which indicate that it is loaded. Specifically, I was told to do the following:

1. Navigate to Library -> Receipts on your main drive (not from your personal folder).

2. Remove all files of the form QuickTime*.pkg, where "*" is a version number. E.g. QuickTime600.pkg, QuickTime650.pkg, Quicktime700.pkg and QuickTime701.pkg. This simply tells your system that those packages are not installed.

3. Go to [www.apple.com] and click on the "download Quicktime" link. DO NOT USE THE AUTOMATIC UPDATE UTILITY. Download QuickTimeInstallerX.dmg. Double click this file (probably on your desktop) and then invoke the installer by double clicking QuickTime701.pkg.

4. After your computer reboots, you should be able to restart FCP and see your camera.

<font color=blue> Shane </font>
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