reminiscence – Why does my Mac mini 2010 flip off as quickly as I see my desktop?

After I set up 2 x 1GB RAM modules and energy on the Mac, it chimes, boots up okay, proper as much as displaying the desktop after which it immediately shuts off. If I flip it again on, it does the identical factor.

Initially it got here with 2 x 1GB DDR3 1066 (PC3-8500) reminiscence modules, however the earlier proprietor upgraded it to 2 x 4GB modules (and an SSD). It runs high-quality on this configuration. Nonetheless, I want to restore this to authentic spec to maintain it as a collectors merchandise (do not ask why…), so I need to change the RAM. I’ve already changed the SSD with an authentic HDD) and with the two x 4GB RAM modules it runs high-quality from the HDD.

I’ve sourced 2 x 1GB Hynix PC3-8500(S) modules, which so far as I can inform have been generally the manufacturing facility put in model (additionally Samsung).

If I reinstall the two x 4GB RAM modules, it boots high-quality and I can use the Mac with no points. I ought to notice that one is a Samsung 4GB PC3-10600S module and the opposite is a Essential 4GB DDR3 1066MHz (so PC3-8500) module, so the working pair of modules aren’t even a matched pair.

My head is telling me {that a} sudden shut off is an influence provide situation. Nonetheless, from expertise, energy provide points are normally when extra energy is required, and I am unable to assist however pondering that 2 x 4GB RAM modules would pull a bit extra energy than 2 x 1GB modules. Additionally, it is particularly on the level the place the desktop picture is displayed the place it shuts off. I actually see the desktop picture for a cut up second — no dock or menu bar — then it shuts off. The extra energy hungry a part of the startup course of is unquestionably behind it, when it spins up the HDD and fan.

It is in nice situation and I’ve totally disassembled it to scrub it so cooling and the whole lot is perfect. I do not hear any indications that warmth is a matter (no fan noise above regular). However I simply wished to make sure this was clear and away from mud, and in addition it was in as near manufacturing facility state as attainable.

I’ve tried to run AHT from the unique disks, however this Mac seems to disregard that because it simply appears to at all times look to tug this over the web. I assume a firmware replace has advised it to do that, so nothing I strive appears to get it to attempt to supply the AHT from native media. After I do enable it to attempt to load AHT from the web, AHT tells me that it’s not supported on this machine.

I’ve used Rember to test every RAM module independently they usually every try. As quickly as I put them collectively, the Mac will not totally boot to the desktop.

I’ve tried combining every module with one of many 4GB modules and the system boots and works high-quality. So it appears the modules are okay in themselves. However this Mac simply does not like the 2 of them to be seen collectively…

Notice that that is on a contemporary set up of 10.6 Snow Leopard on a HDD from the unique set up media. I’ve utilized all the ten.6 updates too.

Does anybody have any concepts why I am unable to run this Mac with the 2 ‘authentic’ RAM modules?