Cannot Instal OS from USB

[LifelineR]

Hey guys I bought a H8-1427 5years ago, it finally hit the bed last friday, I replaced some parts (PSU, Graphics and Harddrives) thought it would be easy but I supposed its never for me. 
Everything is installed great physically, computer turns on fine, Led and everything, Boots up past the HP logo. 
clicking esc does nothing, but selects startup menu, clicking F8 does nothing but selects Boot Menu, clicking F10 does nothing etcetctectect... I tried everything, my Win10 instal menu is installed on my USB flashdrive when I plug it in before booting it never gets passed HP logo (it used to go to black screen with infos for a while but it stopped now?) Im just so done tonight with all this, can any one help me, I need a PC asap. 

[Lil_Boy_Blue]

Hi
Make, Model and OS please.
SKU:
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

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).

[LifelineR]

USB boot was not supported in bios, so it went fine when I tried with a CD. 

USB made me unable to get to the boot menu, all components appart from Motherboard were new (not refurbished), F2 would have been useless in this situation. I know they all worked fine. USB was the problem I guess. 

Moral of the story for anyone having this problem, unplug USB tried to get to boot menu, if you can, install using a disk, everything will go dandy from there.