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Need help understanding this test result on my iMac

This is the message, 4MOT/4/40000003: HDD-1250 I am not sure what it means. I have never worked on my iMac at all. Would love to be able to do this fix.

Late 2009 - MB952LL/A - iMac10,1 - A1312 - 2309 3.06GHz C2D

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Thank you ABCellars. I was on youtube and was trying to select the link to post a video. My computer started acting odd, the page was frozen sort of..i could move my mouse around but it had an odd symbol beside the cursor. I rebooted, and it was still there. The cursor moves but it unusable. I googled and found how to start in safe mode where I can use the cursor, but odd symbol is still present. I ran the test in both modes and I think it was basically the same message both times. I do not know what a SMC is. I would be happy to try that if I knew what it was! :)

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Well then, without knowing it, I did that :) I have unplugged it and rebooted it. No help. Always have to try though!

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serial ends in J5PE I am the original owner. Purchased I believe in fall of 09 OS X 10.6.8 Thank you :)

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Thank you, I will try that!

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I reseated the RAM, rebooted and same. I forgot to mention that the screen is all messed up if I am not in safe mode or diagnostic. There are odd square symbols all over the bottom portion of the screen as well as the odd symbol attached to the cursor. The rest of the screen is greyish white. I ran the quick test again and message ends in HDD 1255. I am doing the longer test again.

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