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RAM memory Slot Issues, only 1 works

I just got a new 2x4GB ram upgrade for my macbook pro.

After I switched the old ones for the new ones, I turn it on and the machine starts beeping. I figured was a problem with the ram.

I thought the new memory was incompatible with my macbook. So I switched back to the original ones, and there comes the beep again.

So I took the bottom memory stick off and leave it with the upper one only. The machine turns on fine. I figured the bottom slot was damaged or something like that.

But then I switched the ram, I put the one stick on the bottom and leave the one on the top empty, and it turned on just fine.

So everything works fine as long I use only one slot, either one, doesnt matter.

Answer this question I have this problem too

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Please tell us the numbers on the new RAM and the source that you got them from.

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Try resetting the PRAM when you change the RAM and see if the problem persists.

Here's how to reset your PRAM:

Shut down your machine. Yes, all the way down, not sleep or logging out.

Press the power button and then press command-option-p-r. ...

Hold those keys down until your Mac reboots again and you here the startup chime.

Let go of the keys and let your Mac reboot normally.

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