Boot problems with MSI (Z97S) Krait Edition + wireless keyboard

[Hanzo_lx]

Hi

I am having problems with a wireless keyboard + mouse.

When I connect the receiver to the rear USB port (I tried several) the computer will not boot, shows 3 codes 99, 9C and stays in A2.

If I disconnect receiver boot without problems.

Configuration:

Intel i5 4670
MSI Krait edition Z97S
16Gb GSkill
SSD 120GB OCZ (Port SATA3)
WD Caviar 7200 1TB (Port SATA4)
nVidia GTX 760 OC

The disks are connected to the SATA 3 and SATA 4 port because 1 and 2 are under the graphic card and is very difficult to connect

Any idea what can happen?

 

[Thelps]

It's normal to see A2 on any successful boot with this Motherboard...

Source: https://forum-en.msi.com/index.php?topic=166987.0

As for the failure to boot with Wireless Keyboard and Mouse attached, try updating your BIOS to the latest version. It's apparently normal for an MSI Z97S Krait to display a range of POST codes before the Splash Screen as discussed in the following thread:

http://www.tomshardware.co.uk/answers/id-2374078/msi-z97s-krait-edition-motherboard-code-shows-post-computer-boots.html

If a BIOS update doesn't solve your problems then check in the BIOS for USB-related options and attempt to tweak them to see if they produce a successful boot. I can read into this further for you after you've tried the above steps.

 

[Hanzo_lx]

Thanks, I've updated the BIOS and the problem is solved. Thanks a lot!