I guess I wouldn't have gotten one anyway.
http://www.wwbt.com/servlet/Satellite?pagename=WWBT/MGArticle/WBT_BasicArticle&c=MGArticle&cid=1031784465955
I have those lines on my G500. I first saw them about 4 months ago. Then around 2 weeks ago, my monitor started buzzing occasionally. It buzzs almost always when it is turned on, then stops a minute or two later, and maybe buzzs again an hour or more later - usually for only a minute or two...