Question PC intermittent boot failure ?

[ADF16]

Hi,so my pc struggles to boot up(one day it works, another day it doesn't)all fans and leds are working fine but I can hear from the sound that when I press the power button the fans go on medium speed, then on max speed, then on medium again and repeat but it won't give me even boot screen. I think its like it tries to power up something but it can't, I dont know why.
Any idea what could be happening?

Aorus B450 Pro
Ryzen 5 3600x
700w thermaltake psu

 

[Fix_that_Glitch]

Where does it stop? At bios screen, or dosn't come on at all?

 

[ADF16]

Where does it stop? At bios screen, or dosn't come on at all?

It doesent come on it at all.Just black screen.

 

[ADF16]

I forgot to mention that some times it works fine only if i unplug every usb devise and power it up.

 

[Fix_that_Glitch]

Ok so the usb info is important. Have you tried pulling one at a time to see if you can find the problem item?

 

[ADF16]

No because my main problem is that for example now my pc is open and works fine and even if u restart it, it still will work fine.BUT if i go to sleep and open it after 8 hours it will get the same problem with the boot.I will try what your said but i dont think some usb devise is the problem because my pc isnt new.It worked fine with this usb devices for like a year.

 

[Fix_that_Glitch]

You keep adding information. Lets start with the usb devices since the pc starts with them unplugged.

 

[ADF16]

Ok i will try it and let your know.