Is my Graphic card failing?

Recently I have noticed an increased number of green/red pixels popping up on my screen. ( they are very easily seen against dark backgrounds but almost invisible against white ones).

these dots are not visible if I take an screenshot!

I use a dual screen system and these are visible on both dispalys including a brand new 32 inch.

and I doubt its to do with any program because my startup DOS screen is almost like a christmass tree.

I have also checked the overheating but the dots occure when I turn my pc on in the morning.

My GFX is a Geforce 7900 GS which i have been using a for a good 4/5 years now I think.

I am just looking for some insight with anyone experiencing simillar issues and can help me resolve this issue. also is there a possibility CPU or connections causing the issue?
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