Motherboard: Asrock 4 Z68 Extreme with bios 1.70
Processor: intel i5 2500k
Keyboard and Mouse: Microsoft Wireless Comfort Desktop 5000

vom was a PS / 2 keyboard attached to the old configuration and then also decided to upgrade. I bought a Microsoft Wireless Comfort Desktop Keyboard 5000. When you restart the system noticed that the screen was locked in the BIOS splash screen for 2 minutes and then proceeded normally.

I entered the BIOS settings and disable the Splash (Full screen logo) and I saw that was caught on the screen:

Version 2.2.1205. Copyright (c) 2010 American Megatrend, inc.

Dr Debug code 98

after 2 minutes or less, following boot normally. Searching the Internet on the problem found in some forums users with the same problem:

ASRock P67 Extreme4 random hang on POST screen (code 98)

the second user, disabling the option "Legacy USB Support" the problem disappears but the wireless keyboard and mouse do not work in DOS mode. This is what happened here, the keyboard and mouse stop funionar during boot and become responsive only on windows.

Anyone experiencing the same problem or have any solution for this case?