ASROCK X299 Taichi XE Manual page 38

b4 Problem related to USB devices. Please try removing all
USB devices.
b7 Problem related to memory. Please re-install the CPU and
memory then clear CMOS. If the problem still exists, please
install only one memory module or try using other memory
modules.
d6 The VGA could not be recognized. Please clear CMOS and
try re-installing the VGA card. If the problem still exists,
please try installing the VGA card in other slots or use other
VGA cards.
d7 The Keyboard and mouse could not be recognized. Please
try re-installing the keyboard and mouse.
d8 Invalid Password.
FF Please check if the CPU is installed correctly and then clear
CMOS.
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