Help! PC build 1st boot, no screen!

I just got my video card today (PCI-E ATI X-850 XT PE) and when I installed it and hooked up my monitor, booted it up and the PC seems to boot normally with no beeps or anything. But I can't get a friggin screen or any signal from the card to the monitor or my TV with S-video or compsite video. The cards fan is running so it's got power. I got a 500W PSU so that should be enough. All 5 of my case fans run fine and my CPU fan also. My CPU temp is normal according to my harcano display. I tinkered with it for bout a half hour and finally got a screen. I don't remember much of what it said, but no errors or anything from what it looked like, just random info came up and I remember it saying sumthin like "update successfully." And it said "Boot from CD-ROM twice at the bottom. So I ctrl+alt+del to restart and see what it does and I never seen a screen again til this point. I didn't make any real adjustments to get the screen to show that time. I know the monitor works fine cuz I have no prob usin it on my old puter. I gotta use a DVI to analog adapter for this card though. So I'm just clueless as to what's goin on, this is my 1st build ever so I'm kinda nervous. I hope to god it isnt' a defective card or mobo or something. Any help would be VERY MUCH appreciated!! I would be grateful if any1 could just even point my in the right direction as to where to look or call to help! Thanks a lot in advance!

 

Does your mobo have onboard vid. If so it can help to disable that in BIOS before fitting an external vid card

 

No onboard vid. Wish it was that simple. My card has 2 DVI outputs though, would it matter which I used? I've tried both numerous times.

 

there's usually a setting where you can select either PCI/AGP as your main display ... is there a BIOS setting like that in your board?