You may need to remove all cards from your MoBo. The basic rule is: Begin with the following components;
MoBo
RAM
Powersupply
CPU
Video Card
Once these five components are functioning, add your Hard Drive.
Install your floppy Drive
install your CD Rom
Install your OS
Use the CD that came with the MoBo
Install your Sound Card
Install other Cards as necessary
Perform Windows update (If you are using Windows)