a vertical line ranges thin black line thick red line periodically appears disappears reappears on external dell 2408 wfp display attached mini displayport-to-dvi maxed out 2011 mac air 13". there no apparent reason. i've changed resolution no effect. regularly clean house booting option-command-p-r , running sudo periodic, verify permissions , verify hdd.
have not seen in bootcamp windows 7 partition.
thoughts?
sounds bad lcd panel on dell, or cable.
vertical lines typically lcd. horizontal lines typically video signal or bad video card. typically because have seen vertical distortions originate bad video card well.
i'd suspect of lcd panel though.
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