crwdns2935837:0crwdne2935837:0Unexpected Shut Down after RAM Upgrade - iMac Intel 27" EMC 2390

Unexpected Shut Down after RAM Upgrade

After purchasing 16GB (4x4GB PC3-10600 SODIMM) of RAM from OWC and installing, the computer seemed to be operating fine. The first unexpected shut down occurred about an hour after the install and has kept happening intermittently since then.

I’ve used disk utility to confirm the drive is in good working order and installed all possible operating system updates. Any suggestions??

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crwdns2931729:0crwdne2931729:0: Yan 20, 2020

crwdns2933897:0crwdne2933897:0

Take the SO-DIMMS out and carefully wipe the contacts with a new pink pencil eraser (not dried out) go with the grain of the pins one stroke per pin to make sure there is not oxide build up, then use a cotton swab with reagent grade 85% isopropyl alcohol.

Try only installing two SO-DIMM and then try the other two.

Otherwise you’ll need to return the RAM to get another set.

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crwdns2944067:03crwdne2944067:0:

Thank you thank you thank you!

crwdns2934271:0Yan 25, 2020crwdnd2934271:0 Luke crwdne2934271:0

@princeunicorn - Did cleaning them help?

crwdns2934271:0Yan 25, 2020crwdnd2934271:0 Dan crwdne2934271:0

It did indeed! I ended up using an eraser first, followed by the rubbing alcohol. The computer seems to be running perfectly.

crwdns2934271:0Yan 25, 2020crwdnd2934271:0 Luke crwdne2934271:0

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iMac Intel 27" EMC 2390

Unexpected Shut Down after RAM Upgrade

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