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I'm wondering has anyone seen anything like this before? Was using my 2009 Unibody iMac this morning and noticed black, burn-like, marks appear on the screen gradually.

The machine wasn't under heavy usage or anything, however the screen felt extremely hot to touch.

The previous week there was condensation looking areas behind the glass.

Any input appreciated, thanks.

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Luke Morton
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  • Condensation from water? This teardown at iFixit can help identify what lives behind the LCD panel. Something's gone kerflooey! – IconDaemon Oct 29 '17 at 14:13
  • No. Don’t open the iMac just for that condensation or fog. See my answer and the linked question. Only if it’s permanent / smoke / particulate deposit would an open and clean and investigation be in order. – bmike Oct 29 '17 at 14:24

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This happens all the time.

Condensation and fog like effects are almost always benign and transient. Shut down form15 minutes minimum and restart.

The image persistence is somthing all LCD will eventually succumb to and some can show that even when brand new. Either power off entirely for hours or days or have an all white screen saver engage and prevent partial content from staying on screen static.

https://en.wikipedia.org/wiki/Image_persistence

bmike
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