no display for TV or monitor

Hi all ,

I have just bought new machine with video card :

"ASUS EAH4670/DI/512MD3 (128bits) GPU ATI RADEON HD 4670 ,Engine Clock 750 Mhz Memory Clock 2008Mhz( 1004Mhz DDR3 ), DVI-I/HDMI/D-sub, DVI Max Resolution 2560 x 1600, HDCP, Full Microsoft® DirectX® 10.1, Built Window Vista, ATI CrossFire X multi GPU Support. iÃm nh¥n: Solid Polymer Aluminum Capacitors greatly extends lifespan+ EMI Shield to reduce EMI interference+ ASUS VideoSecurity Online+ ASUS SmartDoctor."

So it has dvi, hdmi and d-sub ... i start my computer , both of TV or Monitor display XP screen when start windows then this screen loses from TV and still in Monitor . I don't know why ...

Would anybody advise me ?

Solution: no display for TV or monitor

if you only have 1 graphics card, you will not be able to have a dual screen.
There is a cheap alternative cable adapter from the below link which should work:
http://electronics.dell.com/startech_com-video-adapter-a0730796?dgc=SS&cid=39715&lid=1003762
If you have already 2 graphics cards, it should work and is probably just a resolution / drivers problem.

Please note you may need to install the drivers for the video adapter from startech.com

Thanks