I have windows 10 and it says boot device not found install operating system on your hard disk

[AyoA72]

So i bought new ram 8x2 3200mhz corsair and an m.2 ssd 480gb so i removed the old ram and put in the new 8 sticks in the 2 slots and i removed the 16gb intel optane thingy from the m.2 slot and put in the new 480gb ssd and windows 10 is on my hdd because it's impossible for windows to be on a 16gb intel optane thingy 16gb isn't enough for windows and my hdd is 1000gb (1tb) so now when i load my pc i get this: Boot Device Not Found 

Please install an operating system on your hard disk.

Hard dish - (3F0) 

F2 - System Diagnostics 

For more information, please visit: 

http://www.hp.com/go/techcenter/startup

That's the exact message i didn't miss out a single letter, and i have windows 10 and it's saying this must i get a usb stick and download windows from their website on a laptop and plug the usb stick in when my pc is off and boot it?  Because i already have windows so idk if that would work because i don't think you can have windows 10 twice

[Paul_Tikkanen]

Hi:

There is a sequence you have to follow when you remove an Intel Optane memory M.2 device.

If you just removed it from the slot without following the steps that is the most likely cause of your dilemma.

Put your PC back to its original hardware configuration and follow the guidance in the last two sections of the document at the link below....How do I enable/disable Intel Optane.

First you disable it in the Intel RST software program.

Then you disable it in the BIOS.

Then you should be able to remove the intel Optane memory.

HP PCs - Installing and Using Intel Optane | HP® Customer Support