the requirements for fcp are--
Requirements
Macintosh computer with 867MHz or faster PowerPC G4, PowerPC G5, or Intel Core Duo processor; HD features require 1GHz or faster single or dual processors (authoring HD DVDs requires a PowerPC G5 or Intel Core Duo processor) 512MB of RAM; HD features require 1GB of RAM or more (2GB recommended) Display with 1024-by-768 or higher resolution AGP Quartz Extreme or PCI Express graphics card (not supported on systems using the Intel Extreme Graphics 950 GMA) Motion requires the standard graphics card found in any Mac Pro, MacBook Pro, iMac Intel Core Duo, Power Mac G5, iMac G5, a 1.25 GHz or faster PowerBook G4, or a 1.25 GHz or faster flat-panel iMac. Mac OS X 10.4.4 or later QuickTime 7.0.4 or later 4GB of disk space required to install all applications Additional 42GB required to install all optional templates, loops, content, and tutorials (may be installed on separate disks) DVD drive for installation Playback of DVD Studio Pro 4-authored HD DVDs requires a PowerPC G5 or Intel Core Duo processor Replication of DVD Studio Pro 4-authored DVDs requires a DLT drive
your computer should be fine for burning dvds. to find out, simply go to the system profiler and look for "disc burning". it is there in tiger anyway, i'm not sure about jaguar. but the info should be
somewhere in your system profiler.