Applications control your camera. Which app you choose depends on what you want the camera to do.
Use ones like sig recommends or...
• iChat or
• QuickTime Pro or
• iMovie or
• iCamShare or
• ImageCaster or
• EvoCam or
• SecuritySpy or
• BoinxTV or
• iStopMotion or ...
for more, search your Mac's > App Store... for "camera" (without quote marks).
What CMCSK says!
Also, your posted system info shows you using Mac OS X (10.5.7) You should update to the latest 10.5 version:
• Use your Mac's Disk Utility to repair permissions and then
download and apply the latest Combo Update. For your Mac OS,
I think the current one is at http://support.apple.com/kb/DL866
• Repair permissions again immediately following the system restart
that completes the Combo update.