27" iMac (October 2009) Startup Problem

[Maskot]

Here's the gist, I've had this iMac for four years, I've replaced the hard drive after it failed, and I've been having a problem over the past couple months during startup.

When I turn it on, it gives a long beep, the screen remains black and eventually I hear the dvd drive spin up and the screen remains black indefinitely. I restart again, no beep, but screen is black. Restart a third time, same thing as second time. Restart a fourth time, same thing. Restart on the fifth time, I hear the dvd drive spin up right away and the loading screen pops up.

I've verified this is not a ram problem, it shows that I have all 16GB installed through the About Mac window. I've also reseated the ram in various arrangements.

 

[stract]

basically, there are beep codes...according to this article, a single beep indicates an issue with RAM.

https://support.apple.com/kb/HT1547

even though you've checked your RAM, maybe the issue isn't with the RAM itself, but possibly some unreliability with POST finding the RAM on startup. Maybe it's a hint your motherboard is having issues, but that's outside my depth.

 

[Maskot]

basically, there are beep codes...according to this article, a single beep indicates an issue with RAM.

https://support.apple.com/kb/HT1547

even though you've checked your RAM, maybe the issue isn't with the RAM itself, but possibly some unreliability with POST finding the RAM on startup. Maybe it's a hint your motherboard is having issues, but that's outside my depth.

https://www.facebook.com/photo.php?v=712705422090688&l=736244811028979914

I videoed the problem, it seems other people are having a similar problem, I assure you it's nothing to do with ram.