Asus viii extreme boot problem

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Joined
19 May 2013
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6
Hi, I have just upgraded to 6700K with this motherboard.
Latest Bios installed. (1202) - Windows 10 64 bit.
When I switch on the PC from cold it just boots straight into windows and i can not see delete or bios prompts. I can only access the delete screen when i do a reset from within windows. Is this normal? Once booted I have the code bF on the leds.
When i boot up it takes ages for the key board to get power from the usb ports and sometimes switches on then off and on again. The mouse powers straight away. Once booted everything runs fine.
The keyboard is a Razer Blackwidow Ultimate Stealth. I have a samsung 850 evo ssd plugged into m.2 slot with OS on and a HDD junk drive in sata_4 slot.

I had similar boot problems with a Gigabyte Z170 G1 but it would only give me the bios option if i reset the cmos then booted. otherwise once into the OS it worked fine. Also had bF on led. I replaced it with the viii.
 
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