Monitor not displaying anything

[Fitzitz]

I have my older (but still decent) gaming pc to my younger brother for his birthday. He has an older dell monitor, and it works fine with the work computer (very old, 2003) but not with this one (with parts from ~2012-2013 except for gpu, it is an old gtx 260, he is getting a 270x in the mail). Any help guys?

 

[Fitzitz]

It doesn't work with my older acer monitor either, getting really worried here guys