An update on this problem. The monitor is still crashing once or twice a day. I tried with a different cable. 10 minutes later, the monitor crashed again. I tried connecting the laptop to another monitor for 2 weeks. It never crashed. So the problem is this particular monitor. Suddenly, the screens goes single-color, sometimes with a continuous sound, other times silent. There is no solution other than shutting down the computer by force, losing unsaved work. This happens every single day. It is not a memory problem. Today the monitor crashed when there was only Windows Media Player open, no other programs at al. From what I see in this forum, it seems that there is no diagnostics anywhere in Windows that can tell me what went wrong. The solution is obviously to throw the monitor away as it's too late to return it to the shop. But the alternative is keep using the laptop own screen, which hurts my eyes, so it's a trade-off between looking at a small screen or looking at a big screem but knowing it will crash every day and losign unsaved work. Does anyone have any idea of what can be causing the problem? Or if there is any way of knowing, from any diagnostics, or log files, what could be causing the problem? In the meanwhile, I advise all to NOT TO BUY HP24f screen!