My laptop will not start. I had trouble a few days ago where it would not get past the Windows start screen, the one where the bar runs across the bottom of the screen. I switched off and started again, then it was okay. Today it would not start, so I tried it in safe mode. It started okay, so I shut down and tried again. It would not get past the same start screen again, so I tried in safe mode with networking, so I could ask the question. It would not get past the loading drivers in safe mode. I tried it twice more and it has stopped in the same place. The HDD light just stops flickering and the computer locks. Ideas please.