If you run Linux or a Unix variant, sooner or
later, you'll get the 'respawning too fast ...' message on
boot.
One of
ITWorld's
newsletters is
Unix in the
enterprise (its URI is still its old name, Unix Insider), and
in the June 15, 2005, issue, Sandra Henry-Stocker has
an
article on this topic, beginning with a brief explanation of
init, the mother of all processes.
treeps is a
graphical display of processes, and a screenshot of the program's
output shows processes better, IMO, than `ps -ef` or `ps ax`:

treeps running
The author parses /etc/inittab, identifying the colon-separated
fields, helpful in identifying which program init is trying to
spawn, and pointing to your possible typo in that line in
/etc/inittab. So, adding this line to /etc/inittab runs a getty on
tty12, which you can switch to with the keyboard combination
ctrl-alt-F12:
12:23:respawn:/sbin/getty 38400 tty12
the inittab file runs `/sbin/getty 38400 tty12` in runlevels 2 and
3, and if it fails or dies, respawns it.
If you've edited /etc/inittab and introduced an error, boot into
single user mode and restore your previous version of the file. You
did make a copy before editing it, didn't you?