I logged onto my computer this morning around 4:30pm. It was working fine and i was casually on Skype talking to my friends but around an hour later my monitor switched off and displayed ''no signal'' i disconnected all the cables such as the DVI and HDMI and realized that the plug wasn't fully connected to the socket but still after properly connected it still wouldn't display. I opened the case up and had a look, everything seemed fine and working exactly how it looked when it was working but still didn't work. I tried disconnecting the PCI-E's and connecting them again, tightening the screws holding the GPU, Installed all motherboard drivers and turned off the PC by the socket. I currently run the computer through my integrated graphics on my CPU and using HDMI through the motherboard. Also the fans run on the GPU as normal.
P.S - The PC was working for about a week before this happening.
Intel Core i5-4460
ASRock B85 Anniversary ATX LGA1150
Crucial Ballistix Sport XT 8GB (2x4GB) DDR3-1600
WD Black Series 1TB
VTX3D AMD Radeon R9 280X
EVGA 500W 80+ Certified ATX