Nvidia 8600 GT, strange TV out problems

Hello i just bought a Leadtek Winfast PX8600 GT TDH for my computer.
My problem is that i cant get the TV out working! Ive got the latest driver and what happens is when im about to do the
Television configuration in Nview my computer monitor just gets all black! But still no picture in the television.
And the same thing happens when i try to setup the signal format and the type of cable, when i push apply, the screen goes black.
Sometimes i can hear beeps, but i have to reboot and start from "The last know working configuration" or else when i come to windows my screen will go black again.

Before this card i had a Leadtek Winfast PX6600 TD, and then it was no problems with my tv out, it worked properly.


Thanks in advance!