No DVI Output signal from PC

Hi, recently i bought and HP P2-1394 model PC, first i was using it with a "normal" monitor, VGA PC input without problems, but last week i bought a new TV with HDMI input the problem is that i can;t configure it well,
I'm using DVI-HDMI cable.
First, i can't get video signal if the old monitor is not connected, once i get the signal, i disable the old monitor from vga configurations, after restart i can't get signal again. so i need to connect old monitor again and restart PC.
I only want on my desk the new one, not both. Do you know how can i solve this.?

Hi,
Review this posted document for the HP p21394.
The specifications for the HP p2-1394 do not indicate that the integrated video processor will support dual video outputs at the sametime. This may well be a documentation oversight or dual monitors are not going work at the sametime.
HP DV9700, t9300, Nvidia 8600, 4GB, Crucial C300 128GB SSD
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