I wouldn't worry much if it happens not to many times. Just had one myself. The previous was 6 months ago I guess. Just restart, repair PRAM and do a Repair Disk Permissions a few times. That's what I do. Further no problems. Paul Moortgat On 23 Aug 2013, at 00:54, johnny wrote: > lately I have been getting a daily white lettering (negative) on a black screen telling me to restart....seems to be a harbinger of more nasties to come. Can anyone tell me what to check for to stop this madness which of course comes at different times and within different programs. > > dual 867 maxed out. > thanks. > John