Unable to enter Safe Mode

Hi, Entered safe mode a few months ago no problem. Using Windows 8 Pro. Tried to get into safe mode today but have a problem. I have tried all the various permutations to get into safe mode (ms config, start up options etc.). This is what happens: I use MS Config or one of the other ways (tried them all!) to get into safe mode. The computer seems to be booting into safe mode when I...