[SOLVED] No video input, enter sleep mode

[Muszyn]

Hello, today I was assembling a new computer and after starting all the fans are spinning, USB working but after connecting the monitor to the motherboard (I tried DVI, HDMI) on the screen display only "No video input" and after a few seconds "Enter sleep mode" ... I try deal with it for several hours, I do not know what to do I have already tried to unplug RAMs and reset the BIOS by unplugging CMOS batteries ... Any advice?

Motherboard TUF B450-PRO GAMING

 

[rgd1101]

full system spec? include make and model of the psu

 

[Muszyn]

full system spec? include make and model of the psu

Full spec :
psu - be quiet! Straight Power 11 650W 80 Plus Gold
RAM - Patriot 16GB (2x8GB) 3600MHz CL17 Viper Steel
CPU - AMD Ryzen 5 3600
CPU cooler - be quiet! Dark Rock 4 135mm
GPU - Sapphire Radeon RX 5700 XT PULSE 8GB GDDR6
ssd - ADATA 512GB M.2 PCIe NVMe XPG SX8200 Pro
hdd - Toshiba P300 1TB 7200obr. 64MB
motherboard - ASUS TUF B450-PRO GAMING
case - SilentiumPC Regnum RG6V EVO TG ARGB

But now the hdd and GPU are not connected

 

[rgd1101]

you need the gpu because ryzen don't have igpu

 

[Muszyn]

you need the gpu because ryzen don't have igpu

OK, im gonna try to connect it by GPU