My husband and I replaced our 6 yr old MacBook Pro's in November 2016 and have BOTH been getting major graphics problems on screen at startup. The screens simply flash with weird graphics. We have been to Apple shop and had a GeniusBar appointment. We showed them videos of what our laptops are doing and we emailed the videos to them as well. They said that they would escalate the issue to the engineers and that was over 2 weeks ago. WE HAVE HEARD NOTHING !!! Having spent over £3,000.00 we are extremely disappointed that Apple are not sorting this out We changed background picture from one of our own photos to the standard Apple offering, no difference. HAS ANYONE ANY IDEAS - BECAUSE APPLE HAVEN'T GOT A CLUE WHY TWO MACBOOKPRO'S BOUGHT FROM John Lewis IN NOVEMBER 2016 ARE BEHAVING LIKE THIS? A BAD BATCH MAYBE?