I had a similar problem. I own an ASUS X99-E motherboard and while the pc power was off and the plug was inside the psu, and switched off from the back, i switched to XMP mode by moving the switch from the left side to the right side. That caused something to go wrong on my board. I realized as i turned on my computer and no display was there.
The pc was showing led and the monitor led kept flashing. That means the BIOS config is screwd and i chose to reset the board. I also tried to remove my video card and change the cables around from hDMI to dvi etc but no luck even i used video card in another pc, it would work but when put back into my pc it did nothing. To solve the trick you have to clear the cmos in a reliable way. Another issue that caused this, is when i attempt to put another ram stick into the black colored ram slot and i left the grey slot empty and that grey slot must also have the ram present or else no display will be shown. To reset the cmos follow the steps. This is not one of those other practical guides on internet showing you to clear your cmos. I did their way but it did not work. They say to put the jumper on for 30 sec and and then while power is on, shut it down. Its okay but not that accurate. Try my step and it may work. I also did their way, but it didnt work. For new boards its quite differant.
So try this:
- Remove all cords from the board including atx cord, sata cables, connectors for power etc. Remove all components like RAM, cpu, psu cords, video card, sound card, wifi card, usb cards etc.. Remove the cmos battery. Also remove the power cable from the back and switch the pc off mode on the psu. Plug the power cable to the power connector on the board and hold it for 55 seconds to clear charge on the board. In newer boards its 55 sec. In older boards its like 30. Short the two cmos NOT THE BATTERY ONE. This is located near the power terminals. Can be called power or clear cmos.. One for negative and the other positive. Then get the cmos jumper, put it on the board were the cmos terminals are. The one in the middle is ground.
put all components back on. Dont plug any connector back yet. Repeat the short battery terminal step and also put jumper on the cmos terminal of the board for 50 seconds. Then put all cable back in but before plug cable back on board , remove the cmos jack.