Bad Ram Slot
I have seen this happen this happen to several machines lately. Look for these sympthoms as they are an indication of a failing RAM chip, or a bad DIMM socket on the mobo.
To check the new RAM wasn't defective, I tried it in slot 1, a known good slot. All 4 sticks of RAM worked in slot 1, so the RAM wasn't faulty. All 4 sticks work in every slot except slot 2 (the first black RAM slot). If I put any stick in slot 2 - old or new - the PC is dead, it won't even boot to the BIOS. Once you identify the “bad” DIMM, take all the memory of the system and put a chip that you know to be good into the slot where the bad one was before, set the strictest POST in your BIOS and try to boot it few times. You don’t have to go all the way into windows. You just want to see if it passes through the memory test at the POST. Hey guys, I have a Macbook Pro Mid 2012 and it looks like the bottom ram slot stopped working. In order to get the Macbook Pro to stop crashing I had to take the ram out of the bottom slot. I was previously running 2x4gb rams and I've just recently upgraded to 1x8gb Ram. I was wondering if. I shut the machine down, re-seated the new RAM (and verified that I had, in fact, put the new sticks in). One of the new sticks must be bad, I thought. So I swapped them. So it isn’t the sticks. Must be one of the slots. So I booted up with a stick in only one of the 2 slots.
- The system freezes up at random times during bootup:
- during POST
- at the Windows logo
- just before login screen
- right after login
- System turns on, and stays on but never even reaches post
Note that read/write memory errors are not on the list here. Those are dead giveaways, and curiously they were not occurring in most of the cases I worked with. If you experience intermittent, but consistent sympthoms like the ones listed above, start pulling out DIMM’s out of your system. Chances are that one of them might be going bad, or that the DIMM socket itself is on the fry.
Once you identify the “bad” DIMM, take all the memory of the system and put a chip that you know to be good into the slot where the bad one was before, set the strictest POST in your BIOS and try to boot it few times. You don’t have to go all the way into windows. You just want to see if it passes through the memory test at the POST. If the sympthoms go away, you are in the clear – it was just a bad DIMM. Get a new one and go on with your life. If they continue, or if you can’t even boot, then you may need to get a new mobo.
[tags]dimm, ram, memory, bad memory, bad dimm, dimm socket, freezing at post, freezing at windows logo, freezing at login, blank screen on boot up[/tags]
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Is it possible to fix laptop memory slot failure with a guitar pick? Yes, it is. You will not fix the memory slot itself, but you can work around the problem. 🙂
Today I received a Toshiba Satellite Pro 4600 laptop with the following complaint:
Bad Ram Slot On Motherboard
The laptop starts and works properly, but recognizes only one of the two memory modules installed. The laptop has two 256MB RAM modules installed, but registers only 256MB.
First of all, I removed the memory cover to find out if both memory modules are installed correctly. The laptop had two 256MB Kingston modules installed and they were seated properly.
When I started the laptop and entered the BIOS setup menu, I found that only one of the two memory modules is detected and the laptop registers only 256MB (262144KB) of RAM instead of 512MB (524288KB).
Just a side note. In the computer world 1MB=1024KB. That’s why 256MB=262144KB and 512MB=524288KB.
I tried reseating both memory modules but it didn’t help.
After that I tried installing both memory modules in both memory slots one by one and here’s what I found. The laptop worked absolutely fine when both memory modules were installed into the slot A, but failed to boot with both memory modules installed into the slot B.
Apparently, there is nothing wrong with the memory modules and the laptop has a faulty memory slot B. The memory slot is permanently soldered on the motherboard. If one of the slots fails you’ll have to replace the whole motherboard or use the laptop with only one working slot.
Buying a new motherboard for this older laptop wouldn’t make any sense because it’s too expensive, but the laptop is still in a good working condition except the faulty memory slot B, so I continued playing with that trying to find the solution.
Bad Ram Slot Error
I noticed that the laptop start normally with the memory module installed into the faulty slot if I slightly press on the module with my thumb. And this gave me an idea.
This guitar pick is going to fix my laptop. 🙂
I installed both RAM modules back into the slots and then placed the guitar pick over the module in the slot B as it shown on the picture.
I thought if I close the RAM door it will press on the guitar pick/memory module and it will have the same effect as pressing on the module with my thumb. And it worked!
Both memory modules were detected properly and the laptop registered all 512MB. After “the fix” I tested memory with Memtest86+ and the laptop passed the test.
I wouldn’t call it the best solution for fixing a faulty memory slot but in some cases it will work.
Bad Ram Slot Symptoms
By the way, I didn’t charge the customer for this “repair”, he knows what is going on and how I “fixed” his problem.
