Hey guys, I've got more salt to the open wounds.
Attempted installing 8GB Corsair on a 2GB Mac Mini Mid 2010. These are the memory sticks in front of me:
1 1GB Samsung which came on the lower slot, let's call it A.
1 1GB Samsung which came on the upper slot, let's call it B.
1 Corsair 4GB freshly purchased, let's call it C.
1 Corsair 4GB freshly purchased, exactly the same model as C, and came in the same package as C, let's call it D.
All of these memory sticks are tested and work. Firmware is at it's latest update, so is the OS. I have reset the SMC, PRAM, NVRAM, and held the On-button while plugging in the power cord, and any and all combinations of keys (although none of them worked, since the computer apparently can't produce screen picture without having a memory stick in it). I have tried each successful scenario in this and other even remotely relevant threads I could find among the first 50 hits from google on several search term keyword sets.
I have tried several combinations of stick combinations and actions between inserting sticks during the past 6 hours, only to find out that I am about to go insane with rage and foul language. I would greatly appreciate if I could get technical answers as to why each and every of the following facts are found to be true:
Fact 1: several people have succeeded AND recommended installing C/D type sticks on Mac Mini Mid 2010. I have not succeeded installing both C and D at the same time, because when I do, I get the "no RAM" beep.
Fact 2: memory stick A will always work on the lower slot, alone or not. If I replace it with the memory stick B alone, there will be a single beep each 5 seconds (the "no RAM" beep) - memory stick B has not successfully worked alone on the lower slot at any time, in combination with any other memory stick on the upper slot.
Fact 3: memory sticks A and B have exactly the same circuit layout, exactly the same model number, except for the last cipher. Also, the material of the circuit board is lighter green (towards yellow) on A, than on B, which is just a plain green.
Fact 4: memory sticks C and D have been successfully installed (alone) on either the upper or the lower slot. Sometimes they worked (alone) sometimes they did not. They have never worked together, or with B (one beep fail).
Fact 5: I have successfully installed sticks C and D on the upper slot, alone. At first it did not work (one beep fail), then I went to lunch, and turned the computer on, and then it worked. And then it worked repeatedly.
Fact 6: I have successfully installed sticks C and D on the lower slot, alone. Occasionally. On other occasions, they just didn't work. When it worked, it worked repeatedly, when it didn't, it failed repeatedly (one beep / 5 secs).
Fact 7: I have failed installing sticks C and D together (one beep fail). I have succeeded installing A in lower slot, and C in upper slot. Now I have 5GB. That is not what Apple advertises.
What is wrong?
Please help. If possible, someone from Apple, please advise.