Here's the build: CPU: Intel i5 8600K Coffee Lake Mobo: Gigabyte Z370 AUROS Ultra Gaming RAM: 2x 16GB Corsair Vengeance LPX 3000Mhz DDR4 GPU: Zotac GTX1080 Mini PSU: Seasonic Focus 750W platinum OS: Win 10 Pro Storage: 1x 500GB Samsung EVO 850 SSD, plus 2x 2TB WD Black HDD (all blank) Monitor: LG 34UM88C (for gaming/movies), Eizo CS240 (for work) Case: Phanteks Enthoo Luxe (tempered glass) Cooling: Be Quiet Dark Rock 3 Pro Here's the problem. The PC seems to POST (single short beep, after adding a internal speaker to the mobo), a few seconds of HDD/SSD activity via the case HDD LED, but LG monitor is complete blank with a no signal message. The LG monitor is in working order BTW, and before anyone asks I'm normally quite fastidious whilst building PCs (anti-static band and all that jazz...though I wish I had breadboarded first instead of chucking all the gubbins into the case). So I have tried the following so far. 1) Tried switching between Display Port and HDMI with the LG monitor. A single short POST beep and still with a blank monitor. 2) Tried the Eizo CS240 via HDMI, DP, and DVI (and this is also a known working monitor). Same result. 3) Changed the GPU to a working Geforce GTX506Ti. Same result. Changed to a working Geforce GTX750. Same result again. 4) Changed the PSU to a working Seasonic M12 700W with GTX750 installed. Same result. 5) Removed the GPU and connected directly to the mobo HDMI port for the i5 8600K graphics. Same result, which was worrying. Also the mobo has four diagnostic LEDs for CPU, VGA, DRAM, and boot. Whilst doing the above I did disconnect all storage, the boot LED should have stayed lit indicating no OS. It blinked once during POST and that's it. So I believe that I have a faulty motherboard, what do you all think? On a side note whilst searching the webs whilst posting this to see if others have had similar problems with this mobo I learnt that this particular mobo's VRMs can run exceedingly hot which is not what I want from a mobo in a workstation where stability is paramount. If it's faulty I'll be refunding it instead of RMA'ing it.