iMac shows a distorted blank/rainbow pixel screen after turning it on
iMac works when I press the shift key during start up, which then opens in Safe mode, but during a normal startup, after the apple logo disappears and leads to the login page, instead of the log-in page, a half blank white screen, with rainbow pixels distort half of the blank screen. The iMac works as expected during safe mode as the login page appears, seems normal as well as the desktop after login.
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Can you give us your exact model so we can guide you to the correct guide and needed part.
Look at the bottom of your systems foot stand to find the serial number and plug it into here: EveryMac - Lookup then paste your systems URL here for us to see.
door Dan