Thank you Prelude2250. I went to your link you sent and found a NVIDIA Litigation check list to determine if my unit is involved. Although it's in the HP dv6000 series as a dv6736nr, it appears its P/N being a KC304UA#ABA does not fall into litigation and so I suppose doesn't have the defect. So, that great news for me and may explain why I've never had any problems in the two and half years I've regularly used this laptop. Thanks to all of you in helping me research this concern.