Ram slot not working mac

I just bought a new 2. Inside System Profiler it shows two of my sticks as MB. What happened? The first thing one should do is ensure the RAM risers and the individual RAM sticks are properly seated, and that the RAM is installed in matched pairs, following Apple's instructions. Firmly press them down into the riser cards and give them a slight wiggle to ensure they're seated all the way down.

Be sure you are properly grounded so as not to harm the RAM with static electricity discharges. Do this by booting up while holding down the options-command-P-R keys all at once until you hear a second set of boot chimes, then release the keys and allow the computer to boot normally.

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Mobile World Congress Maybe some one in this forum can resolve this, I need a genius here! I also purchased apple care as well. I think it lasts 3 years? What led me to this conclusion was I just purchased a 4GB memory stick of ram recently, this month, to replace the 1gb stick of ram I had in there that is installed in slot, 0, which is the bottom slot closest to the motherboard and works great. However, after trying putting sticks only in the top slot "the one that hovers above the bottom slot", slot 1, I tried both my old 1gb stick of ram and even the new 4gb of ram in that slot and it chooses not to boot up the computer, with both configurations.

Ive tried configurations where I have ran both 1gb in the bottom slot, and 1gb on the top, "total of 2gb" and that doesn't boot up the computer.

When I first got the computer I had it for about 5 months where it had worked with that configuration of having 2 slots filled with each 1gb stick of ram , total of 2gb ram. Is it possible for MAC to fix this for me or is this a software problem? Please let me know what I can do, and your thoughts why the RAM may not be working. These aren't faulty chips obviously, it has to be the top ram slot not functioning for some reason. Reply I have this question too I have this question too Me too Me too.

Mac Pro 4,1 to 5,1 RAM slot 1 not recognized

All replies Drop Down menu. Since the top slot is so sensitive and easy to damage, it is absolutely imperative a quality hot air station is used to avoid damage. Do not use a cheap station since the odds of damage are much higher. It is also a good idea to use a lot of flux to make the solder flow quickly and minimize the heat exposure to the sockets.

If you have not performed such a repair and want to try, spend some time seing which technique works the best and offers the least amount of risk to the top RAM slot on the board. If you determine the job is above your skill level, don't mess with the board and send it to someone who can do the job correctly.

If you're able to repair the board, here's a link to the guide to remove the motherboard: So I cleaned the dead slot with an eraser, and than removed the erase dust with a regular brush and after I used a mechanic pencil to put grafit on the slot so it would be more conductive. I still need to wait for a few days to be sure that the problem will not come back, but than I just have to try the same procedure.

Dan danj.

Self employed contract worker. You state the system doesn't go to sleep when you close the lid or access the menu Sleep instead it abruptly shuts down. The fact your USB devices are burping because the system shutdown incorrectly is to be expected. The first question I have does the system react the same way when you don't have the USB devices connected? If so the system has another problem that is tied into your memory issue.

Faulty RAM symptoms

Question two did you get your system wet or could it have been sat on or twisted? A good clue does it rest on all four feet on a level surface correctly or have a dip in the bottom cover? In either case you may have a short.

Remember Air's are very tight inside and have very little clearance. You may need to open up the system to check things out. Look around the controller chip for water damage or bent cover. It was dropped while in the care of a friend about a year ago and was displaying what i believe are called artifacts on the screen immediately afterwards but was otherwise fine, then if you touched a certain part of the case underside the computer would display artifacts, freeze, and reboot after a few seconds.

For awhile just checking to make sure the case screws were tight would be enough to boot without issue but it finally stopped booting all together. I didn't see any obvious damage but now the computer will only boot with the top ram slot empty. If so what are the likely culprits and how do i go about repairing them? The local mac specialists in my area are just going to want me to replace the logic board which in that case i might as well buy a new one. Deep - Review this MacBook Pro 13" memory guide on what your options are and the needed specs of the memory modules you'll need.

As to your real issue you should try to figure out why your system was having problems. I still find it hard to believe your socket failed you. It's possible you zapped your memory module when you pulled it out or placed it in ESD damage.

Can you tell us if you have dropped or damaged your system in some way. Often when you have multiple problems there is a relation between them. Right after the apple logo appeared after booting, a kernel panic was triggered and all further boot processes stopped.

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The mechanic who helped me also said there was a problem with my hdd sata cable connecting it to the logic board so replaced that too. Last night I had the same problem recurring. Got sick of it and tried an experiment, removed one 4GB RAM slot - the one on the top - and tried booting it up again. I have the same question as Deep: Is it healthy running your Mac on just one RAM? Any long term problems? Can it handle SSDs? A year ago, 15 days after my warranty expired, the MBP gave 3 beeps everytime I switched on the comp and refused to turn on. I asked them to go fly a kite and instead tried my hand with an idiot in Singapore who said he was a certified Mac mechanic.

I got sick and tired of it all and threw the Mac in a box, generally cursing my luck and swearing at Mr Jobs. A year later, a week ago to be precise, I just randomly opened it up and switched it on and it was bloody perfect for 5 days. Nothing went wrong, snappy performance, all apps were fast. Mr Mav was happy.

Mac Pro 4,1 to 5,1 RAM slot 1 not recognized | MacRumors Forums

And then when I updated software, came the grey screen of death "You need to restart your computer" kernel panic. Joakim Hellberg. Had the three beeps, kernel panic, screen roll-down telling me the computer needed reboot etc - even completely dead with only the light going on but no other response whatsoever. All this happened at random and in between the computer was running just fine.

Switched the RAM around and it worked! Got two new 2x4GB and tried them - worked fine for 2 days and then I was back at square For me its the lower slot. Running on a 1x4GB in the upper slot now. So, try moving around your RAM and run it as long as it works. Sounds unlikely that both RAM slots are broken, so try your sticks in one at a time.