computer no longer recognizes my card

[jed_lether]

im a bit rubbish when it comes to hardware, but i have had the cataclysm hogger from this site for quite a while now and only had a problem since yesterday

basically when i open a game the computer says *please ensure you have a grafix card and when i try open nvidea control panel it says no hardware connected

so i took out my card give it a clean and put it in a different slot, but still no luck

is it broken?

geforece gts450 -128bit - 1gb ddr5 (is the card)
ultra durable 3 - h55m-ud2h (is the motherboard)

any help would be greatly appreciated and thank you in advance, i dont think im still under warranty

 

[jed_lether]

if i put the driver cd in it says no nvidea hardware found, ill try rest now

 

[jed_lether]

i went to bios, no idea what im looking for?! also my dvi cable wont work if plugged into the gfx card

 

[jed_lether]

just moved the card back into main slot, and the dvi is not working in the card, can not see bios and monitor says no pc input, then move dvi to motherboard its working, my computer is currently running onboard graphics

 

[jed_lether]

yes the connection is secure, and all those bios options are the same as you have stated, does this mean its dead? also thank you for your help so far

 

[jed_lether]

i purchased my pc from ocuk in aug 2011

https://www.overclockers.co.uk/showproduct.php?prodid=FS-168-OE

i think they have changed the specs of the pc now, im not to sure how to find out what psu im using

 

[jed_lether]

will do, cheers again