I tried it with a different monitor and it was fine. It's only when the resolution is 1024 on either monitors that it gave this problem! So, atleast we know the issue is in resolution and nothing else, I think.
I have a 13" Macbook Pro and whn I use it with a secondary monitor, after a few minutes, the screen goes blank- both the monitor's and the laptop's. It worked fine for 1 day but has hung my laptop about 5 times since- any ideas/ fixes would be really appreciated.
Thanks,
J