Hi! See attached image. The booting process stops at this point. So far I have taken the HDD out, and tested it on a PC with some standard HDD test software (don`t remember which..) in a PATA to USB converter. Software didn`t find anything wrong with the disk. R&S could not offer service on this instrument, or trouble shooting help. Maybe someone here can suggest how to proceed? As far as I know, the instrument have not been dismantled before. I read in another post here that someone replaced a battery on a CPU-board? Maybe there is a battery in this instrument as well?