grub

Q. I’ve upgrade my CentOS / RHEL (Red Hat Enterprise Linux) 4.7 on HP ProLiant DL580 G5 and it is showing unknown NMI errors in the logs:

Uhhuh. NMI received for unknown reason 30.
Dazed and confused, but trying to continue
Do you have a strange power saving mode enabled?

Uhhuh. NMI received for unknown reason 20.
Dazed and confused, but trying to continue
Do you have a strange power saving mode enabled?

How do I fix this error?

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Q. How do I boot my Ubuntu Linux server into Rescue mode to fix system? A. You can boot Ubuntu Linux into rescue mode when things go wrong, there are several ways to work on fixing them. However, you must understand your system and what to fix in case of emergency. Use this mode only […]

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Q. I forgot my root password, how can I get into my system? A. You can reset forgotten root password under Linux by booting system into single user mode or emergency mode (also known as rescue mode). My boot loader is GRUB (see LILO boot loader below) )Following is the procedure to reset root password […]

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Q. How do I boot a Linux system into single user mode?

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