Imac Ram replacement in aluminum duo core now with three beeps!!

Ok, I had a 2 gig stick in a bought a 1 gig stick to put in the other slot. As it turns out both sticks are made by the same manufacturer (Hynix) and both are pc2-5300s-555-12. I put in the 1 gig and got the three beeps with both sticks in. I took out the 1 gig and still with the beeps. I take the 2 gig out and put the 1 gig in it's place and it boots up. I put the 2 gig in the other slot...beeps. I don't understand what happened or why the 2 gig won't work in it's original slot anymore.

Hi Cothirteen
Welcome to Apple Discussions
Perhaps the original module was not fully seated in the slot or popped out when you were adding the second module. Likewise it takes quite a bit of force to fully seat a module in a slot that has never had ram installed in it.
Following the instructions in the link below, it may require a second person to steady the iMac so that you can press real hard on each module with both thumbs.
http://support.apple.com/kb/HT1760
Dennis

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a
Model Name:          iMac
Model Identifier:          iMac11,2
Processor Name:          Intel Core i3
Processor Speed:          3.06 GHz
Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache (per core):          256 KB
L3 Cache:          4 MB
Memory:          8 GB
Processor Interconnect Speed:          5.86 GT/s
Boot ROM Version:          IM112.0057.B00
SMC Version (system):          1.64f5

Ok so it definitely appears to be the RAM. I have found a way to reproduce the crashing....Running Prime95. Its normally takes about 15-30min on the stresstest to get the system to lock up.
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https://discussions.apple.com/message/15610565#15610565
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If you have more than one user account, these instructions must be carried out as an administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
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If there are runs of repeated messages, post only one example of each. Don’t post many repetitions of the same message.
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Anonymize before posting.
Step 2
Still in Console, look under System Diagnostic Reports for crash or panic logs, and post the entire contents of the most recent one, if any. In the interest of privacy, I suggest you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if present (it may not be.) Please don’t post shutdownStall, spin, or hang logs — they're very long and not helpful.

Imac Ram replacement in aluminum duo core now with three beeps!!

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