UPDATE: it wasn’t the cmos battery I replaced it and still nothing,
I just bought a new motherboard and I’m waiting to see if that solves it,
The psu is a rosewell 500 psu and I have a gtx 660 and am i3 3240
I took out ram and gpu and still noting.
I have a motherboard from a dell Optiplex, that has all components in, the only issue is that it doesn't display when all components are in and USB ports don't work, I took out the ram and put it in different slots but nothing, I've replaced CMOS and took out CPU.