Can't get PC to display

Jingo

Bronze Level Poster
Received my new PC yesterday, but I'm not getting any visual output, either on a monitor or TV. I've tried HDMI, DP and USB-C.

Now this might be a really stupid question, but I bought a GPU separately and was planning to install it after I'd checked the PC worked. Should it be outputting an image without the GPU or do I need to put that in first?

My specs:

Case CORSAIR OBSIDIAN SERIES™ 500D SE CASE
Processor (CPU)AMD Ryzen 9 5900X 12 Core CPU (3.7GHz-4.8GHz/70MB CACHE/AM4)
MotherboardASUS® ROG STRIX X570-F GAMING (USB 3.2 Gen 2, PCIe 4.0) - ARGB Ready!
Memory (RAM)32GB Corsair VENGEANCE DDR4 3200MHz (2 x 16GB)
Graphics Card10GB NVIDIA GEFORCE RTX 3080 - HDMI, DP (Xmas delivery not guaranteed)
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Change to: NONE, I ALREADY HAVE A GRAPHICS CARD
1st Storage Drive2TB SEAGATE BARRACUDA SATA-III 3.5" HDD, 6GB/s, 7200RPM, 256MB CACHE
1st M.2 SSD Drive1TB SAMSUNG 980 PRO M.2, PCIe NVMe (up to 7000MB/R, 5000MB/W)
2nd M.2 SSD Drive1TB SAMSUNG 980 PRO M.2, PCIe NVMe (up to 7000MB/R, 5000MB/W)
DVD/BLU-RAY DriveNOT REQUIRED
Power SupplyCORSAIR 850W RMx SERIES™ MODULAR 80 PLUS® GOLD, ULTRA QUIET
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Change to: CORSAIR 1000W RMx SERIES™ MODULAR 80 PLUS® GOLD, ULTRA QUIET
Power Cable1 x 1 Metre UK Power Cable (Kettle Lead)
Processor CoolingCorsair H115i RGB PLATINUM Hydro Series High Performance CPU Cooler
Thermal PasteSTANDARD THERMAL PASTE FOR SUFFICIENT COOLING
Sound CardONBOARD 6 CHANNEL (5.1) HIGH DEF AUDIO (AS STANDARD)
Network Card10/100/1000 GIGABIT LAN PORT (Wi-Fi NOT INCLUDED)
Wireless Network CardWIRELESS INTEL® Wi-Fi 6 AX200 2,400Mbps/5GHz, 300Mbps/2.4GHz PCI-E CARD + BT 5.0
USB/Thunderbolt OptionsMIN. 2 x USB 3.0 & 2 x USB 2.0 PORTS @ BACK PANEL + MIN. 2 FRONT PORTS
 
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