This morning my 27” iMac (2010) when my system starts up will draw a vertical light blue lines, then the appears but picture becomes dotty, like Mac has measles suddenly! The startup of computer ends halfway in the process.
Is it a graphics, backlight or what?
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Sadly your GPU boards VRAM has failed.
Here’s the needed steps to gain access to it iMacのIntel 27インチ(Late 2009/Mid 2010) のグラフィックカードの交換.
Getting the proper board can be difficult. Sometimes re-soldering the VRAM chips can solve this but that takes a bit of skill and access to the correct tools.
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