CPU change no display

[Rondo600]

Help ASAP
Just install new CPU Athlon x4 750k and no display on monitor I here the beep when turn on PC but nothing I install back my old CPU a6 5400k but still same problem no help

 

[inerax]

Check to make sure other power cables have not came lose.

Check to make sure your GPU is seated correct and has not came lose.

Check monitor cables.

 

[Rondo600]

Check to make sure other power cables have not came lose.

Check to make sure your GPU is seated correct and has not came lose.

Check monitor cables.

I don't have Gpu but my old CPU was working displaying without a Gpu