The Dell 2209WA had some DVI hardware glitch that caused these mysterious blackouts.
See extended discussion: http://en.community.dell.com/support-forums/peripherals/f/3529/t/19257125 And upstream: https://bugs.freedesktop.org/show_bug.cgi?id=89110 Some users reported that Sapphire fixed the problem with a BIOS update but for other manufacturers it was always an issue. Using an active DisplayPort adaptor was the recommended workaround in the end. Final comment from Dell: "Posted by DELL-Chris I never could find a solid fix, several workarounds for PC, none for Macs. The issue does not occur for everyone and we could never replicate it in our lab."
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