bios does not recgonize monitor

Hi, recently ive been having problems with my video card (geforce 7900 gs) on my e1705. i figured it was damaged due to lines running down my screen during boot up and not being able to run the current display settings on windows. so i uninstalled the video card and ordered a ati x1400 to replace it. the change went by fine until i powered the laptop on and nothing came up on the screen. i plugged in an external monitor and was able to get picture. i went to bios and saw that it recognized my new video card but under panel it said it was an unknown device. so there was my problem. i tired to unplug the monitor from the motherboard and plugging it back in several times but still same result. any solutions?

 

update your bios maybe. have you got latest drivers for the card?

 

i have the latest driver from dell because i cannot get a driver from the ati site and i have the latest bios update from dell. i also tried reflashing the bios last night but still doesn't work.. any other suggestions?