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I have a 5220 emachine with 512MB of RAM in slot A. I've just bought an extra 1GB and put into slot A. This works OK, but if i try to insert the old 512MB into the slot B, the machine won't boot. Are there certain configuration allowed? thanks
I think you are mixing ram.... Use the same make and module for your ram... when you mix ram, the problem is other ram can be difernt Voltage. some 1.9V, 1.8V, 2.0V, 2.2V to operate. If you have 1.8V and 2.0V the computer won't boot. Hope this helps.
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Where they purchased as a working pair some motherboards will only accept working pairs>? Make sure RAM modules are of same brand and type try one ram module at a time in the working slot closest the cpu if both work individually they are not a working pair
Try swapping the memory in the two slots. It sounds like either one of the memory chips is bad or one of the memory slots is bad. If you find that one of the slots is bad, then you might try just putting a 1GB Chip in the slot that works.
I don't know your specific model, but some of the Emachines had some memory directly on the motherboard. With the 1Gb and 512Mb sticks installed, boot the machine and report how much memory the system sees. Perhaps the onboard memory is causing you to exceed the 2Gb limit.
Please post the memory size you get here with the above sticks.
Check the e-machine website for its frequently asked questions and troubleshooting sections on you make and model of computer. Someone may have had the same problem and had a answer posted. Also check for the types of memory recommended for use in you model, check this list out with the type you are using. IF all that fails purchase a recommended memory pair and see if they work. If not you may indeed have some problem with the memory slots. Try cleaning the slots with spray on instant dry contact cleaner and a small brush like a toothbrush or horse hair brush. See if this improves the connections enough to let the unit use both memory sticks.Hope this helps you with your problem.
The Ram specifications for your model are: 1024MB DDR2 (2 × 512MB), 533MHz (PC4200) Expandable to 2GB
If you are using Microsoft Windows, the operating system will recognize the memory by itself, there is nothing you have to do. Go to your start menu, right-click on "My Computer" and choose "Properties". In the lower right corner of the "General" tab, you can read the amount of memory available to you.
If you want to know how to put RAM into your computer, have a look at this web page - it's a good video instruction. Make sure not to touch any of the electronic parts on the stick itself - try to hold it on the side.
If your computer does not recognize the newly installed RAM it can have different reasons:
The RAM is bad. Nothing you can do but send it back and get it replaced.
You got the wrong RAM. Look at Crucial's webpage (link) and compare the specs with what you've got. They are very reliable and the memory I bought from them always worked.
It is possible that you have to install the RAM in pairs. (eMachine's web page (link) has no download for a manual and does not cover this topic.) It means, that either both memory slots have to be populated or even populated with the same kind of sticks (2 x 512MB, 2 x 1GB).
Solution: try to replace one of your old sticks with the new 1GB stick and see if that increases your memory. If that doesn't work, take both of the old sticks out and put the new 1GB stick in the slot closest to the CPU (look at the video: it's that unit with the fan on top). If that doesn't work either, try the other slot. Last resort would be to contact eMachine. You can either use LiveChat or call them. The contact info is on their web page.
If all fails, come back here and leave a comment including what you did. I will check back and then we go from there.
The DDR means "double data rate", SDRAM is "synchronous dynamic random access memory" and DIMM is for "dual inline memory module". These are the way manufacturers describe the specific speed, type, and packaging of the memory. You need to get the correct combination for your computer in order for it to function properly. The PC2100 is NOT correct, at the very least it will slow your computer down, and possibly will not work at all. You should use PC2700.
If you wish to add another 512MB taking your computer to 1GB total, then you only need 1 module, a 512MB, like the one that came in the computer. Do not purchase a 1GB module expecting it to work properly with the one already there. It probably won't. If you want to max out your computer's memory taking it to 2GB, then you will need to purchase 2 each 1GB modules, and remove the existing 512MB module.
When you go to the computer store, you ask for either "one five-hundred-twelve megabyte, PC2700, DDR, SDRAM DIMM memory module" or "two one-gigabyte, PC2700, DDR, SDRAM DIMM memory modules".
The part numbers from, Kingston, one of the major add-on memory makers are shown here:
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