SSD installation. My ssd doesn't show up in the OS boot manager

[edoa18]

Hi everyone. I installed windows 10 in my new SSD kingston A400 240gb, I removed the old HDD but when I turn my laptop on it says that there is no Bootable Device. I entered in the BIOS and I discovered that the SSD doesn't show up in the OS Boot Manager list ( BIOS insydeh20 3.7).

Using both the HDD and the SSD the OS starts from the HDD, the laptop works but It uses the SDD only as storage disk. 

How can I set it as main disk?

Thanks everyone for the attention

[Huffer]

If you have the model of the laptop correct, that model only has one slot/bay for a 2.5 inch drive. Where have you placed the ssd? Are you using an optical bay caddy?

[edoa18]

I placed it in the DVD slot with a SATA caddy adaptor. i tried to switch the HDD with the SSD and viceversa.

[Huffer]

That is a very important additional fact. What you are seeing is completely expected. A drive in the DVD caddy will not be bootable but is visible to the system. So you can appear to install Windows 10 onto it as the Windows 10 installer app will "see" the drive, but it just can not be the boot drive. Put the SSD inside the laptop to be the boot drive and put the HDD in the optical caddy and let it just be storage.

Post back with any more questions and please accept as solution if this is the info you needed.