Your motherboard is failing its power-on self test (POST). That means that it's checking for all the connections to work and when one doesn't, it powers off, then tries again. This can be caused by multiple issues but if you have the time, you'll certainly find what it was.   The first thing to try is to clear the CMOS on your motherboard. Take the circle-shaped battery found somewhere around the CPU socket and remove it. Keep it off for a minute before putting it back in. With some luck that'll solve the issue. You can also clear CMOS using a jumper on the motherboard, although you'll have to refer to your manual to locate it. Keep in mind this may undo your overclock settings but you should troubleshoot this at stock speeds anyway.   If that's not enough, I recommend taking your motherboard out of the case and trying to turn it on with as little connected to it as possible. Place your motherboard into a non-conductive sourface and connect only the 24-pin ATX connector, the 8 pin CPU connector and a single stick of ram. Plug your monitor into your motherboard's video output. By the looks of it yours has 2 HDMIs and one Displayport. Try to turn it on. You'll know the computer completed its self test when your display shows the logo of the manufacturer.   Hopefully that will have worked. If it did, plug things back one-by-one starting with the other RAM sticks, followed by graphics, then storage. Make sure you test every time you plug something in, this will let you know what component is causing the problem, if any.   If you didn't complete the self test on the minimum configuration, the culprit might be a RAM stick or the slot it's placed in. Try each stick on each slot to see if you power on like that. If that also doesn't work it's probably the motherboard (assuming you placed it on a non-conductive surface, the box it came in is optimal) that's at fault, and you can RMA that. If one of the sticks doesn't work on any slot however, that one's the problem.   Now if you did pass the test once every device is connected, place everything back onto the case and try one last self test.   In this last step, you might get the error again. This is likely due to a piece of metal such as a motherboard standoff that's in the wrong place, shorting the circuits in your motherboard. Look for this metal and remove it, then test again with the motherboard screwed in.   If it shows you the post screen, congrats! Usually by disassembling and reassembling you've fixed a certain contact point that wasn't quite working, and was causing such a problem.   Sorry for the wall of text, I've been wanting to write a little POST fixing guide for a while and I hope you resolve your issue. Cheers!