Memory issue (sort of)

[Grohowiak]

Anybody had something similar happen?
New 6 core imac.
Bought it with 8GB ram, added another 16 and it was good for few days. Got a deal on another 16GB so ordered it. Both Crucial, mac "optimized". No matter what I did mac wouldn't recognize all 4 banks. Black screen and nothing happening no matter how I would insert them. Each set of 2 would run normal on its own no matter which bank I would put them in. Finally decided to run troubleshooter and voila. System showed no errors and now I have full 32GB running without issues (well it appears this way).
Should I just return this unit "in case" and get afresh one or this is randomly/normal occurrence?

Cheers in advance.

 

[davidlv]

Anybody had something similar happen?
New 6 core imac.
Bought it with 8GB ram, added another 16 and it was good for few days. Got a deal on another 16GB so ordered it. Both Crucial, mac "optimized". No matter what I did mac wouldn't recognize all 4 banks. Black screen and nothing happening no matter how I would insert them. Each set of 2 would run normal on its own no matter which bank I would put them in. Finally decided to run troubleshooter and voila. System showed no errors and now I have full 32GB running without issues (well it appears this way).
Should I just return this unit "in case" and get afresh one or this is randomly/normal occurrence?

Cheers in advance.

What do you mean by "run troubleshooter"?

 

[Grohowiak]

What do you mean by "run troubleshooter"?

Press and hold "D" when starting your mac.

 

[davidlv]

Press and hold "D" when starting your mac.

That is usually called the "Apple Hardware Diagnostics" program or the simply the hardware Diagnostic program". As far as I know, it does not actually do anything to repair issues, just runs diagnostic programs designed to indicate hardware issues, such as memory errors, etc.
In most cases, when you add or delete hardware, a Mac will do a good job of recognizing any changes, but something went wrong in your case. Perhaps running the diagnostic application gave it a "kick" somehow.
You might try rebooting while holding down the Option, Command, R & P keys until you hear 3 bongs, that will usually make the Mac recognize any hardware changes as it resets the non-volatile RAM, sometimes called the "P-RAM". If you have set any values in the pram using terminal, they will be reverted to the default.
run this code in terminal; "pmset -g" (without the quote marks) to see what is set now.