Newly built PC not connecting to monitor

[baby87]

Hi

I just built my gaming PC and I am having trouble connecting my monitor to the PC. The RAM lights up, cooler fan works and the front light comes on; but the monitor won't display through HDMI (or any other cable). Firstly, I did not connect the HDMI cable to the GPU HDMI slot, but when I tried it still didn't work. There IS a weird cable that I believe is HDMI related that came attached with the case on the backend, but for the life of me I can't find where it should connect. On another note, the top fan doesn't appear to be working; should this always be whirring?

GPU - AMD Radeon RX 5600 XT
Case: Jonsbo UMX3
Motherboard: Asus ROG STRIX B460-H GAMING ATX LGA1200

Pic of the phantom cable: https://ibb.co/42Tjkcb

Thanks

 

[baby87]

What's the CPU?
Any diagnostic LEDs on mobo?
Is the GPU showing any signs of life?
Have you flashed the BIOS?

Thanks for the quick response.

CPU - Intel Core i5-10400F 2.9 GHz 6-Core Processor

I didn't look for the diagnostic LEDs but I'm sure there weren't any - I will check again

GPU ram sticks are lit up, attached cooler fan works

No idea what flashing BIOS means. I'm a complete novice and this is my first ever build.

 

[baby87]

What's the CPU?
Any diagnostic LEDs on mobo?
Is the GPU showing any signs of life?
Have you flashed the BIOS?

OK so I just plugged it in again. The monitor DOES work but gives a 'no signal' message (the HDMI cable wasn't plugged all the way) but the diagnostic on the LEDs is boot and VGA.

 

[baby87]

https://rog.asus.com/motherboards/rog-strix/rog-strix-b460-h-gaming-model/helpdesk_cpu/

Is this your motherboard? If so, there are downloads and instructions for flashing the BIOS.

Before you do that, have you plugged the monitor into the GPU HDMI slot or the motherboard slot? Make sure you're plugged into the GPU.

So I figured out what it was. The GPU and/or RAM was apparently not pushed in hard enough, all good now thanks for your help.