Eduello :
What are the specs of your PC? Is this a new build or did you originally have a different GPU that you have now replaced with the R9 280X?
My components are Intel Core i5-4590 3.3GHz Quad-Core Processor, ASRock H87M Micro ATX LGA1150 Motherboard, G.Skill Ripjaws X Series 8GB (1 x 8GB) DDR3-1600 Memory,Seagate Barracuda 3TB 3.5" 7200RPM Internal Hard Drive, Gigabyte Radeon R9 280X 3GB WINDFORCE Video Card, Corsair VS 650W ATX Power Supply.
Everything is brand new besides the graphics card. Iv just bought a brand new graphics card and it should arrive tomorrow. So I guess ill find out if its the graphics card or not