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<blockquote data-quote="chscag" data-source="post: 1622489" data-attributes="member: 46727">First of all, you need to understand how your 21.5&quot; iMac cools itself.&nbsp; You'll notice there are vents at the top of the display and at the bottom left and right of the memory panel.&nbsp; Cool air is drawn in from the bottom and warm air exhausted from the top. Plus your iMac has three fans: CPU, Optical Drive, and Hard Drive. Very likely the fan you're hearing is the CPU fan as that is what cools the CPU and surrounding heat sink.The loud beeping, 3 beeps, indicates that there is a problem with the memory. You might want to open the memory door and re-seat the new memory you put in.&nbsp; It's also possible one of the modules is failing or intermittent.The original problem with the fan may be due to overheating or dirt inside of your iMac is clogging the air flow of the CPU fan. Why don't you download a free temperature monitoring app or you can buy one that's inexpensive from the Mac App store, and install it. That will allow you to keep an eye on the temps and how fast the fans are spinning. <a href="http://download.cnet.com/iStat-pro/3000-12565_4-71074.html" target="_blank">iStat Pro for Mac</a> is free and will show temps and fan speeds</blockquote>

[QUOTE="chscag, post: 1622489, member: 46727"] First of all, you need to understand how your 21.5" iMac cools itself. You'll notice there are vents at the top of the display and at the bottom left and right of the memory panel. Cool air is drawn in from the bottom and warm air exhausted from the top. Plus your iMac has three fans: CPU, Optical Drive, and Hard Drive. Very likely the fan you're hearing is the CPU fan as that is what cools the CPU and surrounding heat sink. The loud beeping, 3 beeps, indicates that there is a problem with the memory. You might want to open the memory door and re-seat the new memory you put in. It's also possible one of the modules is failing or intermittent. The original problem with the fan may be due to overheating or dirt inside of your iMac is clogging the air flow of the CPU fan. Why don't you download a free temperature monitoring app or you can buy one that's inexpensive from the Mac App store, and install it. That will allow you to keep an eye on the temps and how fast the fans are spinning. [URL="http://download.cnet.com/iStat-pro/3000-12565_4-71074.html"]iStat Pro for Mac[/URL] is free and will show temps and fan speeds [/QUOTE]

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