Flibbitybop

IT WORKED!! i feel pretty pretty silly the solution was always right there haha. Thanks for your help guys!

IT WORKED!! i feel pretty pretty silly the solution was always right there haha. Thanks for your help guys!

you mentioned "motherboard", on AMD systems you don't have an iGPU (generally) so it will not give ouput in ANY case.
If you have a dedicated GPU (as you do) you have to connect the monitor to the GPU and not to the motherboard (unless you do some sketchy ass shit like using a Tesla)

connect it to your GPU, not your motherboard
 
 

Is the HDMI cable plugged into the videocard, not the motherboard? (so it's in the horizontal ports)

PCPartPicker Part List Type Item Price CPU AMD Ryzen 5 3600 3.6 GHz 6-Core Processor $281.60 @ Newegg Australia Motherboard MSI B450-A PRO MAX ATX AM4 Motherboard $164.20 @ Device Deal Memory Team T-FORCE VULCAN Z 16 GB (2 x 8 GB) DDR4-3200 CL16 Memory $98.33 @ Amazon Australia Storage Crucial P1 1 TB M.2-2280 NVME Solid State Drive $169.00 @ PC Byte Video Card ASRock Radeon RX 5700 XT 8 GB Phantom Gaming D OC Video Card $629.00 @ PC Byte Case Cooler Master MasterBox MB520 RGB ATX Mid Tower Case $118.00 @ I-Tech Power Supply Cooler Master MWE Bronze V2 650 W 80+ Bronze Certified ATX Power Supply $99.00 @ Centre Com Monitor AOC C24G1 24.0" 1920x1080 144 Hz Monitor $280.00 @ BudgetPC   Prices include shipping, taxes, rebates, and discounts     Total $1839.13   Generated by PCPartPicker 2020-07-22 01:04 AEST+1000   1. The stock cooler that comes with the processor is fine.
2. This is still  a good motherboard but for cheaper.
3. Same spec ram but less expensive.
4. A graphics card which is much faster than the rx580!
5. No need for a rmx psu. This one is still great.
6. Good choice of case.
7. Cheaper monitor with exactly the same specs (144hz, VA panel etc.)

All good!

Thanks for your help! I appreciate it.

Awesome! Cheers, i wasn't expecting to get replies so quickly, appreciate it.

PCPartPicker Part List: https://au.pcpartpicker.com/list/TJy4zN
CPU: AMD Ryzen 5 3600 3.6 GHz 6-Core Processor  ($281.60 @ Newegg Australia) 
CPU Cooler: Cooler Master Hyper 212 Black Edition 42 CFM CPU Cooler  ($62.55 @ Amazon Australia) 
Motherboard: MSI B450-A PRO MAX ATX AM4 Motherboard  ($164.20 @ Device Deal) 
Memory: G.Skill Ripjaws V 16 GB (2 x 8 GB) DDR4-3600 CL16 Memory  ($129.80 @ Newegg Australia) 
Storage: Crucial MX500 1 TB 2.5" Solid State Drive  ($165.00 @ Centre Com) 
Storage: Seagate Barracuda Compute 2 TB 3.5" 7200RPM Internal Hard Drive  ($89.00 @ PC Byte) 
Video Card: PowerColor Radeon RX 5700 XT 8 GB Red Devil Video Card  ($711.29 @ Amazon Australia) 
Case: Phanteks Eclipse P400A ATX Mid Tower Case  ($116.60 @ Newegg Australia) 
Power Supply: Fractal Design Ion+ 560 W 80+ Platinum Certified Fully Modular ATX Power Supply  ($169.00 @ Mwave Australia) 
Total: $1889.04
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2020-07-21 22:45 AEST+1000
here you go. only thing im a little iffy about is the storage. but it's my go to.
did not notice that you needed a monitor. my bad.
 
 
PCPartPicker Part List: https://au.pcpartpicker.com/list/xLcTK4
CPU: AMD Ryzen 5 3600 3.6 GHz 6-Core Processor  ($281.60 @ Newegg Australia) 
CPU Cooler: Cooler Master Hyper 212 Black Edition 42 CFM CPU Cooler  ($62.55 @ Amazon Australia) 
Motherboard: MSI B450-A PRO MAX ATX AM4 Motherboard  ($164.20 @ Device Deal) 
Memory: G.Skill Ripjaws V 16 GB (2 x 8 GB) DDR4-3600 CL16 Memory  ($129.80 @ Newegg Australia) 
Storage: Crucial MX500 1 TB 2.5" Solid State Drive  ($165.00 @ Centre Com) 
Storage: Seagate Barracuda Compute 2 TB 3.5" 7200RPM Internal Hard Drive  ($89.00 @ PC Byte) 
Video Card: PowerColor Radeon RX 5600 XT 6 GB Red Dragon Video Card  ($494.03 @ Amazon Australia) 
Case: Phanteks Eclipse P400A ATX Mid Tower Case  ($116.60 @ Newegg Australia) 
Power Supply: Fractal Design Ion+ 560 W 80+ Platinum Certified Fully Modular ATX Power Supply  ($169.00 @ Mwave Australia) 
Monitor: AOC C24G1 24.0" 1920x1080 144 Hz Monitor  ($280.00 @ BudgetPC) 
Total: $1951.78
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2020-07-21 22:56 AEST+1000

sure.
cpu you chose is good.
the cooler is overkill, the 3600 doesn't produce that much heat, the one I picked is half the price and will do fine.
b550 motherboards have better vrms, will be compatible with 4000 series and support pcie 4. it has wifi and it's cheaper than the one you picked.
ram has the same specs, but much cheaper
I've picked a faster ssd
i've picked a much faster gpu, as the budget allowed for it
i've left the case, it's decent.
i've picked a good psu that's half the price of the one you picked.
changed to monitor to a cheaper one to fit the budget, still good VA panel 144hz