So I returned to my laptop (Compaq Pressario A900) after a coffee break this morning and found it to be off. I was quite sure I did not shut it down,:grumpy: Anyway, I attempted to restart it. After some initial startup noises it shut down again. So hit start again toggling F8 safe mode, which informed me that it could not start windows. But there were several options, register restore - no luck, memory check - no errors, disk check no errors, So went thruogh all of them, getting error messages (adress error for a file) at the moment windows should run. In the end there was only one option left: reinstall windows (do you want to save data first? yes? install external memory unit! Inserted memory stick, enter. Nothing detected install external memory, other port, same effect, no data storage :grumpy: and lost the data etc. So it was reinstalling day, and worse yesterday I cleared all the SD cards with dozens of pictures, now lost Fortunately my main system, still somewhere in a moving box, contains the main data, but anyway. So what happened? and is this common and what should I have done differently?