Nothing on the screen, why?

[javierdl]

This is an old Compaq Pressario, 5002CA.
When turn on, everything seems to work fine, except that there is nothing on the screen. I have already changed its video card without much success. Does this mean that the problem lies on the Motherboard? Or not necessarily?

Thanks in advance,

DPC

Specs:
Compaq Pressario, 5002CA
AMD Duron 850Mhz
Nvidia TNT2 Vanta L, 8 Mb