DVD playback is usually over accelerated video drivers and the RCA output jack usually doesn't show such. You can research how to DISABLE VIDEO ACCELERATION on google.com since I will not answer how to do that but it is usual a fix that works.
As to enabling the output, the first step is to connect that to your composite svideo connection on the TV. Only then will most machines allow you to turn it on. The METHOD is not standard so you need to find your manual online at the maker's web site. I do not own your laptop so the method I use of Fn+some Fkey may not apply.
Good luck and fix that keyboard!
In closing I never found a P2 300MHZ to be capable of software DVD playback. It didn't have the chops for that. Somewhere about 500MHz you began to see full DVD software playback.
I RECENTLY AQUIRED THIS UNIT WITH A DOCKING STATION. IT HAS A YELLOW RCA PORT IN THE DOCK BASE. DO I NEED TO TURN ON THE VIDEO OUT FEATURE? IT IS RUNNING WIN 98SE P2 300MHZ 160MB RAM. ALSO CAN THIS UNIT RUN VIDEO DVDS EVEN THOUGH IT COULD BE A BIT CHOPPY? I DID NOT GET A MANUAL WITH THIS.