ASRock Z87 Extreme4 manual Problem related to USB devices. Please try removing all

Z87 Extreme4

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.

FFPlease check if the CPU is installed correctly and then clear CMOS.

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