Question PC problems screen doesnt open sometimes

[dcuniverseonline9]

i have this problem like 2 months now sometimes when i open my pc the monitor doesnt show anything while the rest of the pc is open and it takes like 30 minutes to open normally when this happens what do you think is this a power supply problem or a monitor one?

 

[rgd1101]

full system spec? include make and model of the psu

 

[dcuniverseonline9]

CPU:AMD Ryzen 5 2600
GPU:RX 590
RAM:16GB 3200mhz Gskill ripjaws
Storage:1GB western digital HDD and 500GB SSD
PSU:XFX TS Series 550W
Motherboard:Tomahawk B450