At the very end of booting, my PC blocked. There ware only disturbance lines on the screen, but I could hear a buzzing sound from the PC. This had happened before a fair time ago, and had stopped after various unspecific measures or by chance, but now it occurs again. I have not installed any new hardware lately. Only a small program 3 days ago, but it had booted successfully twice afterwards before failing today. I attach the minidump file and would be greatly obliged if a knowledgeable guru could shed some light.