Alright,
Recently my main PC went tits up, so while its away being sorted, I'm using the laptop, with a proper keyboard and mouse attached on the first USB port, and a monitor attached.
Now, everything works fine apart from when I play a video of any kind, mpeg, avi, asf, whatever. It plays on the laptop screen, but I just get a black square on the main screen.
Laptop - Sony Vaio PCG-FX801.
Monitor - Iiyama Vision Master 1451, 19".
Playing (or not playing) in Microsoft Windows Media Player 9.
Many thanks.