I'm using a dated build but recently snagged a AORUS GeForce® GTX 1080 Ti Xtreme Edition 11G GV-N108TAORUS X-11GD. I'm running this board with an Intel® Core™ i7-4770K and a kit of Corsair Vengeance® 16GB DDR3 1600MHz (CMZ16GX3M2A1600C10).
Ever since I got the 1080, I notice the VGA_LED stays RED:
Q: Is everything working ok other than the vga light being on? A: Yes. All works except there is a situation (very rare) where machine hangs and faults out to BSoD
Q: Have you updated to the latest bios for your motherboard? A: Many years ago. The latest official BIOS was flashed.
Q: Are you using two separate pci-e cables? A: Yes. The PSU has two rails and I'm using plug #1 of each rail
Q: Try with different monitor cables, DVI, HDMI, Display Port. A: I have 2 x DP + 1 DVI monitors hooked up
Bonus: Sometimes, while playing graphics heavy games with certain scenes or heavy actions, I do see a white light flash off the area of the GFX near the power connectors. This is what prompted me to use two PCIe rails instead of a single and I think I haven't seen that POWER_LED go off since.