Resolved 5K iMac Crashing & Instability

[redheeler]

A few days ago my iMac froze up and crashed, I posted about it here. Since then it has happened again several times, and often webpages in Safari and Opera will crash as well.

Has anyone else been having this problem, or is it just me? I updated to 10.11.5 not too long ago, and I also upgraded the RAM to faster 2133 MHz earlier this month. However, the crashing only started last Tuesday.

 

[AFEPPL]

Well you could roll back each of the changes one by one to see if that improves stability...
But in all honesty, that my experience of OS X for the last few years it not really been stable and I've made no changes.

edit i don't have an iMac, but basic trouble shooting.

 

[redheeler]

Thanks for the reply. Yeah I'll try a clean install later.

 

[jerwin]

A few days ago my iMac froze up and crashed, I posted about it here. Since then it has happened again several times, and often webpages in Safari and Opera will crash as well.

Has anyone else been having this problem, or is it just me? I updated to 10.11.5 not too long ago, and I also upgraded the RAM to faster 2133 MHz earlier this month. However, the crashing only started last Tuesday.

You could boot into hardware diagnostic mode.

https://support.apple.com/en-us/HT202731

 

[redheeler]

You could boot into hardware diagnostic mode.

https://support.apple.com/en-us/HT202731

Thanks for the suggestion, I hadn't even thought about running the Apple Hardware Test to be honest. It found an issue with memory (PPM002). Not sure why it lasted two weeks without an issue...

I'll have to make sure the RAM is seated correctly. Sure hope it's not that one of the sticks went bad.

 

[redheeler]

Update: It appears that's exactly what it is, one of the sticks has gone bad. I'll have to contact the Amazon seller and ask for a return. Thanks again for the suggestion @jerwin.

 

[maflynn]

also upgraded the RAM to faster 2133 MHz earlier this month

It appears that's exactly what it is, one of the sticks has gone bad.

Thanks for the update, and glad you found the issue. When ever a change to a configuration occurs, its best to look there first, even if it was working fine for a short period of time.