We know that the bios on the motherboard works with the video card to find a connected display so the suspect parts are video card, motherboard, hdmi cable and display.
If any bios on the motherboard or video card is out of date, update those first and if you don't get a display on power up such as the bios screen then you return video card and then the motherboard for another model unless the support for such products tells you how to fix it.
I recently completed my first build, and it has been running smoothly except that I cannot get the HDMI between my monitor and computer to work. I am forced to use DVI because the monitor does not recognize any HDMI signal. Here are my specs:
MONITOR: ASUS VS248H-P
PROCESSOR: Intel Core i7-3770K Ivy Bridge 3.5 GHz LGA 1155 77W
MOTHERBOARD: MSI Z77 MPOWER LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0
VIDEO CARD: HIS iCooler H777F1G2M Radeon HD 7770 Ghz Edition 1gb 128-bit GDDR5
MEMORY: Kingston HyperX 16GB (4 X 4 GB) 240 Pin DDR3 SDRAM DDR3 1600
HARD DRIVE: Western Digital WD Black 1TB 7200 RPM 64 MB Cache SATA 6.0 Gb/s
POWER SUPPLY: CORSAIR HX Series HX750W ATX12V 2.3/ EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS GOLD certified
DVD BURNER: LITE-ON DVD Burner - Bulk 24x DVD+R 8X DVD+RW 12X DVD+R
COMPUTER CASE: Corsair Carbide Series 400R Graphite grey and black Steel
Both my MOBO and Video Card have HDMI slots, however currently the cord is connected to my MOBO (through the back of the computer). I was wondering if I needed to connect it directly to my video card, however the video card is inside the case and does not have a port to the outside of the computer. I have tried cycling the VGA/DVI/HDMI settings on the monitor. I would be grateful for any feedback. Thank you very much!