Inaccessible Boot Device

[Hermeez]

I have just bought a new Ryzen 5 2600 CPU, a H450 gaming motherboard and 8gb of Crucial ballistix 3200mHz ram. I get the error message inaccessible Boot device every time I try to boot windows. I have a 250GB Samsung SSD (boot) and a 2tb Seagate HDD, which I unplugged as it is not the boot device and I wanted to minimise components. I've tried resetting to backup, removing the battery, and changed sata cables and ports, I really want to avoid doing a reinstall of windows.

[F___M]

if default in bios is set to uefi, and the ssd was loaded legacy bios, you need to set to legacy boot.

[Hermeez]

I'm sorry but this solution didn't work, I ended up loosing my temper and resetting my PC, which worked. I'm now in Windows but after installing all the necessary drivers I now cannot connect to the internet I even updated the bios from version F2 to F40. My network shows up in both ethernet and WiFi but I have the little yellow triangle and no connection. I'm calling it a night and trying again tomorrow.