Sony DW-D56A Reading Problems

Here’s the problem:

I have just purchased a new Dell Inspiron 6000 with a sony DW-D56A DVD ±RW drive. The problem is that if i write a dvd with a movie on it and place it in a standalone dvd player it doesn’t play. But if i play it on my laptop it runs without any problems. The same thing happens with PS2 games. If i write a PS2 game on a DVD-R and play it on the console it doesn’t start, or it starts but it doesn’t run for more than 10 sec.

I have tried both PDS7 and PFS3 firmwares, Maxell, Verbatim, Circle DVD-R, TDK DVD-RW and it doesn’t work. Has it something to do with regions? Because I believe that the drive is a RPC-2. (I’m from Europe)

What should I do?