Hate to be the bearer of bad news but if you check the hp forums you will find that this has become quite an issue with the nc6000. Motherboard has gone bad. Problem is that all this version of board seem to develop this problem over time. I have been working on this problem for a couple of weeks. Have tried another board bought through ebay but of course with my luck this one also has the same problem. If you are having boot issues try pressing on the top right hand side of the computer just above the keyboard and almost guaranteed it will boot up. Problem is that it is very unstable, any wiggleing of the display will cut it out again. Seems to be a problem around the cpu socket area of the board.