|@sluc: Battery is OK. Start time and date are always correct.|
@Hopperfox: I tried also Microsoft fix it: No result.
@Fingers: I updated BIOS, but I had already the current version, no change
But, as I have said, all features run fine after rebooting. But if I shut down and switch on the PC-> the same problem. I removed now the mainboard and will send it back to the show tomorrow.
message edited by klaus-hd