bank1

Question

bank1

Hi Everyone,

This is my first time posting and I am having troubles with my mid 2009 macbook pro (with 4gb memory) waking up from sleep. I resetted my PRAM and SMC but it didn't work. I narrowed it down to the memory because I noticed it would say I had 2GB memory instead of 4GB. I took the memory out and put it back in and my macbook pro woke up from sleep perfectly fine.

The problem arises when I restart my mac. It would freeze and then the screen would go black and the front light would be on without any blinking or flickering thus causing me to hard shutdown.

Afterwards, I checked my Memory at about this mac and found that it would have 4gb or 2gb and it would change intermittently. I found out it was my bank1 that was going from empty to existing. The strange thing now about my bank 1 is the following information I see.

BANK 0/DIMM0:

Size: 2 GB

Type: DDR3

Speed: 1067 MHz

Status: OK

Manufacturer: 0x80CE

Part Number: 0x4D34373142353637334548312D4346382020

Serial Number: 0x85B3D2E1

BANK 1/DIMM0:

Size: 2 GB

Type: DDR3

Speed: 1067 MHz

Status: OK

Manufacturer: 0x0000

Part Number: 0x000000000000000000000000000000000000

Serial Number: 0x00000000

As you can see, the original manufacturer and part number and serial numbers are overwritten with 0s. How do I fix this problem? I also made sure that I didn't see any pins when I put the memory sticks in there.

MacBook Pro, Mac OS X (10.6.8), Memory problems Bank 1/DIMM0

Posted on Mar 8, 2013 10:49 PM

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Answer 1

mende1

Level 10

93,624 points

Mar 8, 2013 10:55 PM in response to MonkeyButtPriest

Welcome to the Apple Support Communities

Have you tried to put the memory that it's now in BANK 0 into BANK 1? If you haven't done this, try this, and tell me if your Mac detects the memory. If not, the logic board may be damaged, an expensive repair.

If it's detected, you simply have a defective memory. Buy more memory in OWC or Crucial in order to replace that damaged memory, or to put more memory than the one you have now on your computer

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Answer 2

Mar 9, 2013 12:06 AM in response to mende1

I've did that. It seems that the memory themselves are fine which leads me to believe that my bank1 slot is broken. Upon inspection the bank1 (bottom slot) looks perfectly fine. I really hope that it is not a logic board issue but rather that my memory just slides out by a little bit..

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Answer 3

mende1

Level 10

93,624 points

Mar 9, 2013 12:09 AM in response to MonkeyButtPriest

If it's a bank problem, it looks really bad, because the memory banks are connected to the logic board. The only thing you can do is to take the computer to an Apple Store or reseller to get your computer diagnosed and repaired. Anyway, I think that the whole logic board will have to be replaced, but if they can replace only the memory bank, you are lucky

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Answer 4

Mar 9, 2013 12:12 AM in response to MonkeyButtPriest

In my frantic rage, I pressed the memory really hard into the bottom slot and I think that may have fixed the problem but I'll keep you posted. Thanks!

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Answer 5

mende1

Level 10

93,624 points

Mar 9, 2013 12:15 AM in response to MonkeyButtPriest

Curious. Glad you have fixed the problem, but strange that the problem only happens with one specific slot

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Answer 6

Mar 9, 2013 12:28 AM in response to mende1

It didn't work sadly... It turns out it probably is the logic board.

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Answer 7

mende1

Level 10

93,624 points

Mar 9, 2013 12:29 AM in response to MonkeyButtPriest

I rectify what I said. The only solution is to take the Mac to an Apple Store or reseller. I hope that not the whole logic board has to be replaced, but it looks like it will

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Answer 8

Mar 9, 2013 1:45 PM in response to mende1

I fixed my problem by just taking out the memory out of the slot is broken which was the bottom slot (bank 1) now everything is fine. I guess I'll buy a 4gb memory to put into the working slot to get my 4gb memory back.

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