Apple logo and loading bar blur like when the room in dark . External display working fine . I re installed macOS and restarted multiple times . How to resolve this ? Is it backlight hardware issue ?
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Did you install any new software onto your system? The graphics engine which drives the display does offer a blur function which might be active here.
If the blur changes as the image changes. It does appear the back light is working at least where we can see an image. And as you are able to see an image on the external display I think it's safe to say the display unit has failed. I've not seen this exact effect but it could have been cause by the display getting physically damaged.
Here's the guide to replace it MacBook Pro 14" Late 2023 (M3) Screen Replacement
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