The problem you are having is the DVD player. Not all DVD players will play a burned DVD. Some set top DVD players are know for being very picky about what type of DVD's they will play, and Phillips is very bad about this.
If you have the owners manual for the DVD player, look inside and see what type of disc's are playable. if it should play them DVD-R, DVD-RW, DVD+R. DVD+RW should all be listed.
Right now about 80% of DVD players do not play burned DVD's
In time they all will play them, but for some unknownn reason, some are still made without this ability.
Also, not all DVD-R's are created equal.
The best quality of DVD's to buy for burning are Taiyo Yuden. But Sony, memorex, and Maxell are also pretty good.
One way to be certain about the quality of the burned DVD's is to take one to a friends house or anybody you know who has a set top DVD player and see if it plays in their DVD player.
That will at least tell you if the DVD's you are burning are at fault or not. But my guess is that you r Phillips is the culprit here.
I hope this was helpful to you, if so a good rating would really be appreciated.
I have been buring DVD's since they started selling them for the PC. compatibility has been the only problem I have had.
My sony DVD player plays everything I throw at it.