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原帖由: Bob Clingan ,

标题:

Fan at max speed, vertical lines, burning smell

文本:

My Early 2009 iMac (3.06 GHz Intel Core 2 Duo) has recently had an extremely loud fan. Using a fan utility I can see that its the CPU fan that is running at max. After a period of time, the screen will go to vertical lines and fan is off.  I'm wondering what makes the fan run high in the first place- and why does it shutoff eventually?

How can I diagnose? I'm unable to boot into diagnostic mode, that appears to be something added in later models.

设备:

iMac Intel 24" EMC 2267

状态:

open