when you install dedicate or discrete video graphic card the pc bios automatically disables integrated gpu.  that is normal.  if your pc without discrete gpu installed still has no video from integrated gpu, then it can be an issue.
 The integrated graphics in my Vostro 220 isn't working. It works with dedicated. Is this an indicator that my motherboard is bad?
Vostro 220 Integrated Graphics not working, is it a bad sign?