video card not responding

Just got my computer a week ago. Worked fine the first two days, but now im having problem such as: RAM "STOP erros" which cleared up when i switched their slots around(although somtimes the error comes back) and now when i try to run a video game(unreal tournoment 2004) a box comes up listing things like my prcessor and other hardware with a the brand and so on of the device, but when beside the video card it sais none. I took it out and put it back in to make sure it was there but nothing hppend. I thought it must be the driver so i reinstalled it, and now when i restart my computer, whn the user logon scren should appear, its black with static white lines.

please help with all three problems

if needed you can contact me at [email protected]

 

Are you able to try the video card in another computer? Are you certain the RAM speed is compatible with the motherboard? Just a thought.

 

wouldnt that a showed up when i first ran it. Its been working for three days