PC takes long time to boot. Much longer than normal. No changes made.

What could be the cause, how to find out, what to check?

OS: Win 10 Home
mainboard: ROG STRIX B450-F GAMING
CPU: AMD Ryzen 5 2600 Six-Core Processor 3.40 GHz
GPU: Nvidia GeForce GTX 1050Ti
RAM: G.Skill F4-2400C15-8GTZRX (16 GB)
PSU: Cooler Master Power PC ATX GX RS-550-ACAA-D3 550W 80 Plus Bronze SATA