http://news.bbc.co.uk/2/hi/technology/8388253.stmMicrosoft says that a problem with its Windows operating system, dubbed the 'Black Screen of Death' is not due to its latest security update.
Some Windows users are confronted by a totally black screen after they log on to their system.
It was thought that a security update on 10 November had been the cause, although this has now been discounted.
Reports suggest the problem also affects Windows Vista and XP, which experts are putting down to malware.
Had not seen or heard of this yet.