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Calzadilla
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Click here to see the profile of this user 		RAM memory PowerBook G4 - 2007/06/12 15:54 I have a PB-G4 with 1.5 GHz PowerPC and 512 MBDDR SDRAM. It's the aluminum 15" version. It came with two 256 MB cards of RAM memory. I bought 2 Samsung 512MB PC2700 333MHz DDR SO-DIMM cards and replace the old 256 with the new 512. Problem is that the machine has not changed its configuration and it seems to me that is working at 512 MB capacity instead of double, which is what should have happened with the two new cards. Could it be possible that it is only 'reading' one card? It says that the lower slot is empty and that the upper slot has 512MB.
Thanks for your cooperation,
FC
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harryb
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Click here to see the profile of this user 		Re:RAM memory PowerBook G4 - 2007/06/12 17:08 Hi and welcome.

Make sure your new RAM is Apple compatible. Most PC RAM is high density and is not suitable for Apple Macs. Check out the specs with either this web site or your manual. Memory is the most touchy item in your Powerbook.
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Tamashii
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Posts: 19
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Click here to see the profile of this user 		Re:RAM memory PowerBook G4 - 2007/06/13 11:05 I agree, memory is VERY touchy, especially in a PB. I have a 1.25g PB and had the logic board replaced 3 times due to bad RAM causing it to burn out.

What's interesting here is that AppleCare told me that Samsung manufactured the RAM for them and that any Samsung RAM would work, and so far (for me) it has for just over 2 years now.

Have you opened it back up and made "absolutely" sure that both cards are "completely" set in their slots? I had to do that the first time and found that they looked and felt like they were in all the way, but after taking them out and putting them back in, they registered fine. Perhaps moving the card from the "good" slot to the "bad" slot, and vice-versa will shed light on it.

If this does not work the problem out, you should run Apple Hardware Test and be sure that one of the RAM sockets hasn't burned out -- you can also have a genius from an Apple Store do this for you.

There was a recall on certain PB models because of this problem (mine was not incuded) but perhaps yours was. Go to Apple.com/support or call them with your model number to check.

If the slot is bad, hopefully you have Apple Care still in force, as you may have to replace your logic board.

Best of luck,
Brian
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Calzadilla
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Click here to see the profile of this user 		Re:RAM memory PowerBook G4 - 2007/06/14 09:34 Dear Tamashii,
thanks for your reply. I shfted the cards. I put the one I had on the top slot in the lower slot and still the machine system profiler says that the lower slot is empty. This means that is not the card, right?
I still have the old 256 MB cards. Do you think that it would be a good try to install them back in to see if the slot is burn out?
Best,
FC
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Tamashii
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Click here to see the profile of this user 		Re:RAM memory PowerBook G4 - 2007/06/14 09:53 Well, quite frankly, I think it would be a waste of time, you now know that something is wrong, because swapping the cards should have worked. But it also won't hurt to try to put the 256's back in - you might get lucky.

I found the Apple Technical Document that outlines the recall I mentioned yesterday:

http://docs.info.apple.com/article.html?artnum=303173

It tells you everything you need to know to see if your PB is included, how to locate serial number, get it fixed, etc. Hopefully, yours is included and they will fix it for you.

Please keep us informed as to your progress.

Brian
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krowmagnum
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Click here to see the profile of this user 		Re:RAM memory PowerBook G4 - 2007/06/14 17:11 You should put the original RAM back in the PB and take the new RAM back to where you bought it. You most likely have high density RAM and need RAM that meets Apple's requirements.

Does the RAM (512's) have chips on one side only ? If so, there is your problem.
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