Graph­ics glitches

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This is­sue is raised in the lat­est

Mac­For­mat, so I thought you might be in­ter­ested in my re­cent ex­pe­ri­ence. I pur­chased my first iMac in April, ergo I am an in­ex­pe­ri­enced user, and im­me­di­ately ex­pe­ri­enced what is ap­par­ently called a rain­bow screen on shut­down. Like you, I sus­pected a graph­ics card fault but I was as­sured all was okay. It was sug­gested that it was a soft­ware prob­lem and I spent con­sid­er­able time and ef­fort mak­ing sure that there were no cor­rup­tions. Also, I tried all the po­ten­tial so­lu­tions in your Ge­nius Tips ar­ti­cle with­out suc­cess.

Still sus­pect­ing a soft­ware prob­lem I iden­ti­fied that the rain­bow was caused by ei­ther the rem­nants of an Ex­cel spread­sheet or an open no­ti­fi­ca­tion when clos­ing down. I solved the prob­lem short term by al­ways us­ing ‘force quit’ be­fore clos­ing down. I then dis­cov­ered that us­ing the + and key­board short­cuts to close pro­grams solved the Ex­cel prob­lem. The other part was solved by al­ways mak­ing sure that any no­ti­fi­ca­tions were dis­missed. An­other so­lu­tion I found was to purge mem­ory be­fore shut­down.

There is much dis­cus­sion about this on the in­ter­net and a lot of blame be­ing placed at the door of Ap­ple, but no­body else seems to have found the so­lu­tion I now use, or in­deed any sim­ple so­lu­tion. I sus­pect my long history from MS-DOS on­wards, where cor­rect process was drummed in to me, has led me in this di­rec­tion. Many of us are used to the foibles and rel­a­tive in­sta­bil­ity of Mi­crosoft Op Sys­tems that re­quires user knowl­edge of the nuts and bolts to re­solve. The Ap­ple Unix-based prod­uct seems to me to be aimed at peo­ple who want to use the com­puter with­out know­ing what is go­ing on un­der the hood. Also, I have now adopted the

+ short­cut to close down. It seems to be much more ef­fec­tive at clean­ing the sys­tem, and ap­par­ently purg­ing mem­ory, on close down. by Nor­man Jack­son

graham says…

We’d al­ways try Howard’s ad­vice first, which is to re­set the SMC and NVRAM. See is­sue 316 or head to­setSMC_VRAM. If that doesn’t work then read­ers will ben­e­fit from your other so­lu­tions Nor­man.

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