Memory Upgarde for 2010 MacMini

I'm truly glad it worked out for you, and also that you can take all that trouble as lightly. That said, I beg to differ on one of your accounts:

If it really wasn't meant to be opened, Apple should be marketing their hardware (or certain serial number spans) as non-upgradeable, as opposed to providing a how-to sheet detailing how to open the casing to change the memory. As a software developer on Apples products, and knowing many others, I can note that hair-pulling is more of a rule than an exception with Apple, so I am out of excuses for them.

This exact "Apple experience" has been systematic to all my work on Apple products, so in the end, I find the degree of customer contempt coming from this company, in disguise of incoherent, incomplete, obscurely implied, and plain incorrect information, unacceptable. If they had improved the ratio of people actually working on products (and documentation is a technical fact-based product!), to that of people lollygagging in their legal, sales, and marketing, I am sure the quality and coherence of all their products would improve enough to make me more positive to Apple as well.

As it stands, I only wish that I, my customers, and my employer, and our mothers, could send Apple a bill on every hour wasted due to incorrect marketing (as opposed to documenting!) of their products, features, and API:s. All we want to know is the price tags, up-front. No excuses. Just correct price tags.

I have a Late 2009 Mac Mini 3,1 and have been experiencing the exact same issues in this thread when trying to upgrade to 8GB ram from 4GB. I bought 2x Kingston 4GB chips from amazon and only the top slot seems to work. Installing the old 2GB chip in the bottom slot with the new 4GB in the top worked too, leaving me with 6GB total. I've tried just about everything here on this thread, resetting PRAM and SMC, swapping chips in various configs, without any luck of getting either the entire 8GB or just the 4GB in the bottom slot working.

BUT! As a last ditch resort, I tried Gigdan's solution. I installed the 8GB chips into the Mac Mini and left it unplugged overnight. In the morning, voila! It worked! I have no idea why it worked and can verify it didn't the night before. But as a guess, there was probably some latent energy in the computer keeping whatever initialized the memory still active. Give it some time to completely power down and dissipate seemed to work for me. Hope this helps someone.

Count me in. I was supposed to upgrade three MM4.1 with 2x4G yesterday and was sent a batch of the latest KTA-MB1066/4G. I have spent 20+ years as an Apple techie and can tell this is probably the strangest RAM problem in history.

Kingston has always been great the few times there has ever been a problem and I do recall they shipped a batch of this type of modules and they were also 4G where some might stop working. That was an early batch and something we got replacements for and replaced cost free the coming weeks back then. The stores was replaced withing days and the modules has not been seen since. The problematic modules was marked 222 but the replacements read something else, like 442. Just too bad I never got a mail about it. Anyway, it's a strange coincidense that the very same part number is still plagued with other problems and like some say - it's different modules in different computers and from different manufacturers. Wonder if it's a frequency problem where radio noise inside the computer interfere.

I had a white MM3.1 exposed to capitalise on the 2x2GB ”fishing tackles” so during the crazy installation (before coming here) I did use it to verify that every single 4G-module was fine. They are not affected in the MM3.1 but only the MM4.1.

The first computer would only start with a 2G-module in the lower slot (closest to motherboard). After some 50 trials I had to leave it with 6G as I was scared the slot might be worn out in my attempts. Nothing helped to get 4G booting in the lower slot.

The next mini had problem with the upper slot (away from logic board). After some resets and shuffled reseats the mini started fine with 2G in the lower slot and a 4G in the upper, but only when I kept pressing the start button for 2 seconds. If I did like with the 2x2G and just touched the start button nothing would happen. The next time I touched the button it would start at the same moment but always to the RAM fault sound. This was a change in how you had to deal with the button. I replaced the lower and it booted just fine with 2x4G but had to tell the user to always push until the light would come on or else they would crash in the next attemt if she lost it. It didn't make any differance if I hold the button pressed in the first mini.

The third mini was fine right away. 2x4G like it should!

I guess the start button might help someone else but I will later try to install 2x4G and have it rest unplugged over night.

I've repared a few firewire ports on the B&W G3's this way so I know the miracle might help. That was told to be fried components back then and Apple later (perhaps it was in the G4's they) put an extra wire on the female port to protect the circuits.

Count me in.

I bought Kingston MB1066K2/8G from Amazon it has "equiv Apple P/N MC016G/A" printed on it which is listed by Apple as being specifically for the Mid 2010 Mac Mini: http://www.parts-quick.com/mc016g-a.html

either stick worked in the outer slot, neither stick worked in the inner slot. Tried SMC reset. Tried NVRAM reset. Tried leaving it powered off for a long time. Gave up. Observed that 4g+1g (original) worked giving 5gb.

Then I switched this Kingston 4+4 to a late 2009 imac and they worked, replacing older 2gb+2gb modules, which I moved to the Mac Mini, and those worked there as well.

Very frustrating, and a long waste of time.

I doubt the memory is faulty so something about the specifications causes them to be rejected by Mac Mini 2010 but accepted by iMac late 2009, and clearly this Kingston part is NOT equivalent to Apple P/N MC016G/A -- or apple P/N MC016G/A may not work with Mac Mini.

Or.. the Mac Mini is correct and I got a bad pair, but the iMac doesn't yet notice, and I can't run the hardware memory (AHT) test on either mac to check, because OSX 10.9 upgrade removed it.

I don't like to resurrect old threads but I have a solution that worked for me and the last post was this year at least, lol.

I was installing 8GB of memory in about 10 iMacs for a client last night and the last of the night would not POST, even after I put the original memory back in (It had to to be the last one....). Tested and identified that both sticks were fine but only worked in the top slot, anything in the bottom slot and the dreaded 3 beeps.

A little tinkering and I got it to POST every single time if I used a plastic (non conductive) pen to push the lower stick down slightly, there appears to be an issue that causes the memory to sit angled slightly too high and not properly touch all of the contacts. I experimented with using something (again non conductive) between the two sticks to help hold it down, but it tended to also push the first stick up, which caused the same issue again.

My final solution is difficult to describe but it involved adding a little bit more downwards bend to the memory "arms" that hold the ram in place, so that the bottom stick made proper contact without anything foreign being used. It now POSTs fine every time with all 8GB =)

This thread helped me realize it wasn't just me or the memory at fault but a problem many had experienced, which inspired me to keep investigating. I hope someone else can find this helpful someday too!

Many thanks to hazmat222 -- your solution helped me after I nearly gave up after dancing around with the tambourine and doing other shamanism with plugging and unplugging the power cord and all this seconds counting. Booting while pushing down the lower ram board with the plastic pen -- hearing the chime -- switching off -- bending a bit the lower slot arms -- and now I have 8 GB in my Mac Mini! Well done hazmat222!!

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