Hi, I'm posting on behalf of my father; he's over eighty and has been an enthusiastic Mac user for many years but has hit serious issues after upgrading to High Sierra OS on his iMac (now 8 years old). Initially he just got a blue broken display (image file attached )with Apple symbol in the centre and a progress bar that half completed and stopped; he rang Apple help line who just told him his machine was obsolete and nothing could be done to fix the problem ("thanks, guys!"). I looked up some advice on-line and we tried re-stting the NVRAM and SMC, which we appeared to do, but the machine then just moved to a grey screen with similar apple logo and progress bar (image file attached). He has had Time Machine running a back-up on a separate 1TB drive, which he's disconnected for the moment. Any advice or recommendations of good technical support in the Birmingham UK area would be gratefully received. Dad's stuck in his retirement flat most of the time, so he really misses being able to use his iMac and having to make do with his iPad Air (...like I said, he's a great Mac enthusiast!). Many thanks in advance for any help.
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