It sounds like you have a hall sensor failure, if your machine fills with water and then does the buzz thing without the drum ever moving in the cycle.
The Hall sensor (part number 6501KW2001A) has failed. The hall sensor is rather easy to replace, and is covered by a seven year part warranty (in the US). Take the back cover off. Take the big nut off and remove the motor rotor. Remove the bolts holding the motor windings. Remove the electric plug on the sensor and unclip it from the motor winding. Snap new sensor on and reassemble.
Usually takes under a half hour. On a difficulty scale of 1 - 10, it might rate a 4. This should be a Fix-Ya for your machine, and at basically no cost!
In the US, find a
service provider using your zip code at
http://us.lgservice.com/index_b2c.jsp or
call LG at 800-243-0000
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