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Message: <blockquote data-quote="loki86" data-source="post: 1610624" data-attributes="member: 334705">FirmwareI just assumed the issue was related to heat *see first post* as external displays worked just fine etc. And I actually believe the Beta fixed the problem by upgrading my firmware during installation, an upgrade I could find nothing for with mavericks. Since installing and running Yosemite on an external drive and switching back to my internal Mavericks install I haven't seen a single flaw in my display. Granted, this is only an assumption... for all I know it could just be a highly unlikely coincidence that my display started working properly after the install.</blockquote>

Verification: How many occurrences of a n-u-m-b-e-r between "d" and "f" in this example...(sdgs6ngklu3gd#f9%)?