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<blockquote data-quote="dtravis7" data-source="post: 1331205" data-attributes="member: 8287">I have the same iMac 2007 2.4Ghz 20&quot;.&nbsp; First the Startup Sound on pretty much all Intel Macs comes from the Internal speakers even if an external is plugged in.&nbsp; The Jack does not work until you are in OSX.&nbsp; Even my iMac G5 iSight was that was as is my 1.5Ghz G4 Mini.&nbsp; No sound through the external speakers till OSX is booted.The Red Light is the Optical Digital output.&nbsp; If you are getting no red light, it's NOT in optical mode.Have you checked System Preferences and sound and the Output Tab?&nbsp; Are there any options there?&nbsp; What does it say there?&nbsp; Mine says Headphone Port when my external speakers are plugged in.Did you do a Clean or Upgrade install of 10.6.8 Snow Leopard?It's starting to sound like the lightning strike did damage.&nbsp; Hearing the startup sound through the internal is not the same as through the port.&nbsp; More circuitry is involved for that port after OSX boots up.&nbsp; That buzzing sound really bothers me like something is damaged.Let me know on my other two questions.[ATTACH=full]16298[/ATTACH]</blockquote>

[QUOTE="dtravis7, post: 1331205, member: 8287"] I have the same iMac 2007 2.4Ghz 20". First the Startup Sound on pretty much all Intel Macs comes from the Internal speakers even if an external is plugged in. The Jack does not work until you are in OSX. Even my iMac G5 iSight was that was as is my 1.5Ghz G4 Mini. No sound through the external speakers till OSX is booted. The Red Light is the Optical Digital output. If you are getting no red light, it's NOT in optical mode. Have you checked System Preferences and sound and the Output Tab? Are there any options there? What does it say there? Mine says Headphone Port when my external speakers are plugged in. Did you do a Clean or Upgrade install of 10.6.8 Snow Leopard? It's starting to sound like the lightning strike did damage. Hearing the startup sound through the internal is not the same as through the port. More circuitry is involved for that port after OSX boots up. That buzzing sound really bothers me like something is damaged. Let me know on my other two questions. [ATTACH=full]16298[/ATTACH] [/QUOTE]

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