Boot from USB doesn't work (AMI BIOS)

[Fantassy]

Hi, (First of all sorry for if my english isn't that good, It isn't my first/native language)

Today i got a PC from father he asked me to install windows 8.1 (X64/64-Bit) on it.
First i bought windows 8.1 and Clicked for the ISO option then (i didn't have any CD at home and he was asking for a clean install instead of updating) burned it with the program Rufus 1.4.6 on a 36GB USB , It all worked (~30min) but then when i restart the PC, enter BIOS and set Boot priority to USB it just say's "Checking Nvram..." and then it gives me flash a white stripe 5/6 times (_), Also for some reason i need to press Quit & Don't Save instead of Quit & Save because when i do press Quit & Save (F10 here) it just restarts the PC.

I tried the USB on my own PC and it worked fine but when i try it on his one, The results are always the same, I know the procedure for flashing a new windows over an old one since i already done this twice on my own PC.

His Specs are quite old actually, i made it for him a couple of years ago between 2006-2008
Motherboard :Asus M3N78-VM
CPU : AMD athlon 7750 Dual-Core
GPU : ATI AMD Radeon HD 3400 Series
Ram : 3GB DDR3
Windows : Windows 7 Professional 32-bit
Bios : AMIBIOS v2.61

Mine are :
Motherboard : Asus 2011 Sabertooth X79
CPU : Intel Core I7 3370K Quad core
GPU/Graphics card : MSI GeForce GTX 780 gaming 3G
RAM : 12 GB DDR3

I don't think that it's because of spec since he does have the Min Requirments.
I hope someone know a solution to this problem.

 

[menetlaus]

With the USB device in the PC, boot it and try pressing F8 (often) from when you hit the powe button (stop if you get the windows splsh screen).

I am not 100% sure that F8 will do it, but there is usually a key that will bring up an option to select boot device (one time thing-without going through the BIOS). If F8 doesn't work - see if it says something like press <F9> to select boot device or <del> to enter bios/ufei.

 

[Fantassy]

Thank you for your answer, it worked for me.