1. Connect a supplementary power connector to you graphics card
2. Connect your monitor to your graphics cardr I/O
3. Run your computer and download the latest nvidia drivers
if your power supply does not have them then you need to buy an new power supply that does
posters here TOLD YOU, you were going to need a new power supply
if you are not going to listen to what people are saying, why are you posting here asking for help when you FAIL because you are not heeding their advice?