I just bought a new Radeon R9 270 graphics card and a Corsair RM550w PSU. With the graphics card plugged in no display come up on my monitor then after a few seconds my computer switches off then back on again. I don't get this problem with the integrated graphics. I have messed around with different BIOS settings but to no luck. The only two solutions to this that I can see is my power supply is not strong enough of I have a faulty graphics card. One of the minimum requirements for the GPU is a 500w PSU. Mine is 550w so is that too close? Should I return the GPU? Need a quick answer!