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11-13-2015 10:30 AM
Thank you Antvan for your assistance - it didn't fix the problem because F11 gets the 'Windows did not shut down properly' screen. However on one of the F8 attempts it carried out a lengthy CHKDSK with lots of deleting, recovering orphans and cleaning. Again, once complete it restarted the PC and the flicker was back. Thanks again - if you think of something else, I would be grateful.