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Mac Forum / General / Hardware / February 2006g5 memory upgrade and crash
Hello, after upgrading the RAM in my G5, 1.8ghz from 1gb to 2gb, it starts, shows the correct number of DIMMs, status OK with the correct speed, but after about 20 minutes running, the screen freezes and then I see the grey screen telling me I have to restart. I currently have 4 x 256mb DIMMs installed. I tried to install 2 x 512mb DIMMs. When I take the 512mb DIMMs out, the machine runs as usual. What have I done wrong? Greetings, Gregory Wiest > Hello, > after upgrading the RAM in my G5, 1.8ghz from 1gb to 2gb, it starts, > shows the correct number of DIMMs, status OK with the correct speed, but > after about 20 minutes running, the screen freezes and then I see the > grey screen telling me I have to restart. Check your RAM with memtest. Run it for at least one full day (no kidding). http://www.memtestosx.org/ _x. -- Only one "o" in my e-mail address > > Hello, > > after upgrading the RAM in my G5, 1.8ghz from 1gb to 2gb, it starts, [quoted text clipped - 6 lines] > > http://www.memtestosx.org/ Thanks for this recommendation! I don't understand what it did, but memtest solved my problem. I started up this morning with the two 512mb DIMMs installed and in the course of the day ran memtest three times. The errors it showed made me think that the € 170 I had paid for them was gone for good. But after a re-start, I ran memtest again and this time it found no errors. For the first time also, my machine hasn't crashed with those DIMMs installed. Thanks again, Gregory Wiest > I started up this morning with the two 512mb DIMMs installed and in the > course of the day ran memtest three times. The errors it showed made me > think that the ¤ 170 I had paid for them was gone for good. But after > a re-start, I ran memtest again and this time it found no errors. For > the first time also, my machine hasn't crashed with those DIMMs > installed. It doesn't make much sense. Be sure that the memory chips are well set, and run the test 100 times at least. If it fails in any way, you need to know which DIMM is faulty, so mark the chips (1 and 2, for example) and run tests individually. Then, exchange the bad one, it's under warranty. Memtest allows to create a log file that you could provide as proof of malfunction. As all pieces of electronics, memory chips tend to be faulty either in the first few weeks or after some years. We tend to "burn in" all the new equipment (CPU's, disks, RAM). Back in September I had to check all the memories of our Macs. It turned out that more than half of a batch of 256MB DIMMs were faulty. They were provided by a specific vendor when we bought Macs with additional memory. He had to replace them. _x. -- Only one "o" in my e-mail address > Back in September I had to check all the memories of our Macs. It turned > out that more than half of a batch of 256MB DIMMs were faulty. They were > provided by a specific vendor when we bought Macs with additional memory. > He had to replace them. Okay, yesterday was a fluke. Upon reading your response, I started to run Memtest. It started showing lots of errors. Soon after that, the system crashed. I'm not sure how I can isolate a faulty DIMM as they are installed in pairs. I will now run Memtest for at least 100 times and see what happens. At the moment, after the re-start, I'm down to Block Sequential with no errors. Greetings, Gregory Wiest > I'm not sure how I can isolate a faulty DIMM as they are installed in > pairs. By pairing it with a good one. > I will now run Memtest for at least 100 times and see what happens. > At the moment, after the re-start, I'm down to Block Sequential with no > errors. You can stop the test at the first error. _x. -- Only one "o" in my e-mail address > Only one "o" in my e-mail address Last night I finally ran Apple's Hardware Test. It showed which DIMM is damaged. Now I have to learn how to tell which slot is number 5. Greetings, Gregory Wiest > Last night I finally ran Apple's Hardware Test. It showed which DIMM is > damaged. Now I have to learn how to tell which slot is number 5. The number should appear on the board right next to the slot.  SignatureMike Rosenberg <http://www.macconsult.com> Macintosh consulting services for NE Florida <http://www.cafepress.com/macconsult,macconsult4> Mac-themed T-shirts <http://bogart-tribute.net> Tribute to Humphrey Bogart > > Last night I finally ran Apple's Hardware Test. It showed which DIMM is > > damaged. Now I have to learn how to tell which slot is number 5. > > The number should appear on the board right next to the slot. The numbers <strong>are </strong> next to the memory slots, but they count from one to four in both banks. Can I assume that the odd-numbered slots are in the upper bank and the even-numbered ones in the lower? I thought I would locate the offending DIMM by switching it with its counterpart and re-running Apple's Hardware Test. If the damaged DIMM moved in the error report, I would know which one to take back to the store. However, while the program was testing the RAM, the screen froze, command lines showed up and welcomed me to Open Firmware, saying that some illegal command had been given. I tried exiting with CRL-Z and got a 'User Abort' response, but clicking return only brought me a new line. I eventually just hit the power button. Greetings, Gregory Wiest > > > Last night I finally ran Apple's Hardware Test. It showed which DIMM is > > > damaged. Now I have to learn how to tell which slot is number 5. [quoted text clipped - 4 lines] > count from one to four in both banks. Can I assume that the odd-numbered > slots are in the upper bank and the even-numbered ones in the lower? For the record, after acquiring a magnifying glass, I finally see the small numbers next to the larger ones near the DIMM-slots. The top bank reads: J12, J14, J42, J44 and the bottom bank reads: J11, J13, J41, J43. Since my damaged DIMM is in slot 5/J41, the odd numbered slots are in the lower bank. Greetings, Gregory Wiest |
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