This is from a old post on Tom's hardware.
The red light next to the pci-e slot. Is the board testing the hardware. In your case the graphics card. Red means. An error with the gtx 980 card.
- It may need to be checked that it is seated right in your Pci-e slot.
- The card may be causing stress on the Pci-e slot when inserted, make sure it is parallel to the slot. And that where you screw it to your case it has not dropped down slightly, if so undo the screw holding it. Lift the card up and tighten the screw again.
- You have a power related problem, check that the Pci-e 12v from the Psu are fitted right to the card.
- Check that the eight pin 12v connector on the board is also fitted right.
- Check what the wattage requirements needed to run a Gtx 980 card and the amp rating required.
- The check your PSU to see if it can output enough wattage and the amp rating of the 12v rails is enough