Question about Apple iMac G3 Desktop
On Macs in particular, there's a common reason: The iMac doesn't feel compelled to match the monitor's available refresh rates. Mine threw me a few times until the monitor OSD came up and said VSYNC NOT AVAILALBLE: 40Hz. Just pick a 60Hz mode or get a monitor with better multisync capabilities, and there you are, sorted.
If not that: The card went bad with some frequency, so it could be a bad old card (usually overheated DDR;) or, like on PCs, it could be that it came unseated and just needs a nudge (replace the CMOS battery (PRAM battery in MacSpeak) while you're in there, or it'll bug you about it being 1969 on startup.)
Posted on Mar 13, 2011
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Posted on Jan 02, 2017
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