I thought this was common knowledge already. The info. has been out for quite a while now.
When your phone is bootlooping, all you have to do is hold the power button down until your phone powers off, then:
How to boot into recovery mode
Volume down & Power, when the LG logo appears release and press them again, then press the Power button three times!
That's from the cyanogen mod G2 info. pages: http://wiki.cyanogenmod.org/w/D802_Info
Current Phone: LG G2 - Self-built Shadow Rom KK4.4.2
Current Tablet(s): Nexus 7 16GB (2012) - CM10.1.3, Nexus 7 32GB (2013) Stock, rooted, and unlocked
Retired Phone(s): Droid X, Galaxy Nexus, SGS3
Retired Tablet(s): HP Touchpad