Install hard disk

[Bicent]

I need help with my laptop it says Please install an operating system on your hard disk and I don’t really know what to do 

[Lil_Boy_Blue]

Hi

Unsure of your Model...

https://support.hp.com/gb-en/products/identify?q=Hp%20Stream%20Laptop%2014-Cd1xx&filter=-1&origin=pd...

Best guess....

https://support.hp.com/gb-en/product/hp-stream-14-cb000-laptop-pc/18162662

But the SKU:  will tell us.

Make, Model and OS please.
SKU: if possible 
System SKU: N6K07EA#ABU

Please do not post Serial Numbers.

First:- Turn off the computer, press and hold the PWR button for 4 seconds.
Then - Leave only keyboard and mouse connected, disconnect all externally connected
devices such as Docking Station, USB storage devices, displays, and printers.
Unplug the AC adapter from the computer.

Next - Press and Hold the Power button for 15 seconds to Hard Reset.
Rinse and Repeat; Re-Connect the AC adapter.

NOW begin checking/testing/proving the Hardware is fit for purpose.
Power on your PC, press ESC (repeatedly), then F2 at the prompt.
Choose System Tests (Fast Test does a 4 minute hardware check).

https://www.microsoft.com/en-us/software-download/windows10

The stream may come with 32 Gb of storage, and it is quite often filled up by Windows. 

Then the automatic F11 function is disabled.

So we want to go a single step at a time.  Any error messages or blue screen you can post please.

If in doubt please ask.