Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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Replaced PSU, beeping once, no video

So I previously posted about my iMac not booting up, thanks to some help I replaced the power supply and I have power and 3 LEDs. But now I'm trying to turn the thing on and get the fan noise and all that but the screen stays black and it continues to beep once every 4 seconds or so. I read that it's possibly a RAM issue, any suggestions or recommendations?

Thanks!

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The 4th LED indicates that the LCD panel is connected and communicating. The Mac "should" boot with it disconnected but just for the sake of trying maybe disconnect/reconnect the LCD panel and attempt to power on again? The single beep is also a RAM error, you might try isolating the RAM by installing one DIMM at a time and trying to boot.

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Well I'm guessing its the monitor if the last LED isn't on. I think I reconnected everything properly though..when I unplug the LCD temp thing the fan kicks on a lot faster, it might not be anything but I feel like something simple is wrong and idk what it is. Also don't know what a DIMM is. It boots up fine just no 4th LED and no display and it beeps once every few seconds..

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DIMM = Dual Inline Memory Module (aka RAM card or chip)

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You think it's a RAM issue even though the 4th LED light isn't on? I have everything reconnected the right way and still getting black screen and beeping.

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No I don't think that I answered your comment about "don't know what a DIMM is" - (LikeARabbit said he had a machine with bad RAM exhibit your behavior) Have you connected an external monitor to the system? That may work. If it doesn't it points to a VGU/VGC problem.

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I got the beeping to cease with new RAM, still no monitor or 4th LED. Don't know how I would go about connecting an external monitor (what do I need for that? At this point it could be the cables or the whole screen could be out, ya?

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Your internal cable, inverter or the actual LCD could be the culprit.. listed in order of least->most cost & work to check/replace... Yes you need a mini-DVI to your monitor type connector/adaptor to check that the VGU/VGC is working.

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