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Apple Computing Products:
macOS - Desktop Hardware
2008 iMac 20" Display issue
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<blockquote data-quote="chscag" data-source="post: 1469170" data-attributes="member: 46727"><p>It appears to be a graphics problem. Your iMac has a built in graphics adapter, either an ATI HD Radeon 2400 XT or an ATI Radeon HD 2600 PRO (depending on the model). The adapter could be failing or it could be the LCD itself that's defective. The only way to find out is attach an external monitor or TV to the iMac to see if it displays OK or if the same symptom occurs. You'll need a mini DVI adapter and cable in order to attach an external monitor or TV.</p></blockquote><p></p>
[QUOTE="chscag, post: 1469170, member: 46727"] It appears to be a graphics problem. Your iMac has a built in graphics adapter, either an ATI HD Radeon 2400 XT or an ATI Radeon HD 2600 PRO (depending on the model). The adapter could be failing or it could be the LCD itself that's defective. The only way to find out is attach an external monitor or TV to the iMac to see if it displays OK or if the same symptom occurs. You'll need a mini DVI adapter and cable in order to attach an external monitor or TV. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
2008 iMac 20" Display issue
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