A Strange Boot Problem!

[QuadRoe]

I've 1*240 gb SSD and 1*1TB hdd in my pc and i've encountered a strange boot problem today!
I've OS on my SSD and rest data in HDD!
When i start my pc, It shows ""No Boot Device Found, Click Any Key To Reboot Machine." Okay!

and when i start my PC, and enter bios (del/f12) and just simply exit it without changing anything in bios, It Just Boots up Normally!

It's Really strange (for me atleast) and this started randomly today when i started my pc!

Any Help would be appreciated (i don't have much knowledge in these software parts of PC)

My Specs (if any helpful)
OS: Windows 10 Home 64bit
Processor: Ryzen 1700
Motherboard: AORUS AX-370 Gaming K5
RAM: 16gb RAM
PSU: Corsair CX 600
Graphic Card: AORUS GTX 1060 6gb OC
Cabinet: Corsair 400C
Thanks a lot

 

[Nerdy Nerd]

So at random times on booting, it says no boot device found but then when you enter and exit bios without changing anything, it then works? That is weird. Check your sata cable because maybe its teetering on the edge of working/not working.

 

[SkyNetRising]

and when i start my PC, and enter bios (del/f12) and just simply exit it without changing anything in bios, It Just Boots up Normally!

Try disabling Fast Boot in BIOS.