Dual Monitor Problem...

Hi,
I just bought another montior and a new graphics card (to setup dual montiors) however the system works fine for a while then it locks up. My question is if the computer locks up (like it will work fine for 2 min, then these red lines go all over the screen then it locks up) if it freezes before windows even boots (it will freeze when I am changing the BIOS) does that mean that card is not compatiable with my system? Anyone know how to fix it? Any help would be appericated thanks!

 

 

 

 

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