Bootable Memory Test Diagnostics
This is intended to be a one-stop shopping place for memory diagnostics. Comments and suggestions are welcome!
What you'll need:
- a blank CD
- a
computer with an internet connection where you can download a file,
install a small program, and burn a CD (doesn't have to be the computer
that you'll be testing).
1. Windows Vista and Windows 7 have built in diagnostics. Use them if possible, instructions are here: http://www.bleepingcomputer.com/tutorials/tutorial146.html
2. Bootable memory diagnostic tests:
- Memtest86 Outdated - DO NOT USE
Description here: http://www.memtest86.com/
Download the file from here: http://www.memtest86.com/memtest86-3.5.iso.zip You must unzip the file before you can burn (NOT copy) the ISO image to a CD.
- Memtest86+
Description here: http://www.memtest.org/
Download the file from here: http://www.memtest.org/download/2.11/memtest86+-2.11.iso.zip You must unzip the file before you can burn (NOT copy) the ISO image to a CD.
- Windows Memory Diagnostic NO LONGER RECOMMENDED Description here: http://oca.microsoft.com/en/windiag.asp
Download the file from here: http://oca.microsoft.com/en/mtinst.exe Extracting the .exe file will allow you to save an ISO file onto your computer.
3. If you do not have a disk burning program that's capable of burning ISO images to your CD drive, I suggest this free tool: http://isorecorder.alexfeinman.com/isorecorder.htm Select the appropriate version by following the instructions, Install the program, then reboot your system.
FYI - an ISO burner will place files in a certain order on the disk, this is what makes the disk bootable. You CANNOT just copy the file to a CD - it won't work!
4. Insert the blank CD into the CD drive and dismiss any dialogs that may pop up. Then right click on the ISO file that you downloaded and select "Copy Image to CD" (it should be the top choice on the context (right click) menu. Follow the prompts to record the image. Remember that the slower the speed you select, the less likely it is that there will be errors in the burn process. Most disk images are small, so the process shouldn't take very long even at the slowest speed.
5.
Boot from the CD to run the test. Here's a partial list of ways to
access the built in boot menus of different systems. Press the
appropriate key when the first screen shows up after you turn the
computer on.
HP/Compaq - Esc
Dell - F12
Gateway/eMachines - F10
Acer - F12 (not always)
Toshiba - F12 (older systems will be different)
Sony - usually will boot to CD, may ask you to "Press any key to boot from CD"
When
in doubt, either access the BIOS (Setup) and make the CD drive the
first boot device (before the hard drive), or post in the forums for
assistance.
6. Follow the prompts on the screen to run the test. Run test for a minimum of 3 passes (some recommend a minimum of 7). Overnight is better. There's some discussion that I've seen that running the test too long will generate errors eventually even if the RAM is good - I doubt that this would be true with an overnight test.
If the test starts spitting errors, stop the test. The next step involves opening up your computer.
7. To open your computer, first unplug the system by pulling the plug from the back of the computer. If it's a laptop, also remove the battery. Open the case so that you can access the memory slots and blow any dust out of the case (so it doesn't get in the slots and cause problems with the connection). Then ground yourself by holding onto the metal of the case (to prevent static discharge from damaging the memory chips). Remove the memory sticks by unlatching the clips at either end (Desktop) or on the sides of the modules (Laptop). Note that the sticks have little notches in them to ensure that you put them back in the correct way.
8. Insert one chip in the first slot (it doesn't matter which one you choose, as long as you keep track of them). You will feel the clips snap back into place when doing this - but double check to make sure that they're solidly inserted. Then plug the system back in and run the memory test. Make sure that you keep track of which chips you have and which slots you've tested them in.
9. Once the test is done unplug the computer again and ground yourself on the metal of the case. Remove the chip and set it aside. Then test the rest of the chips one at a time - following the steps above.
When that is done you'll know which chips passed the test and which didn't. There's 3 possible outcomes here:
- all the chips passed the test
- some of the chips passed the test
- none of the chips passed the test
If any of the chips passed the test, use that one to test the rest of the slots. If all the slots test good, then it's safe to assume that the chips that tested bad are bad. If the chip only passes in some of the slots, then it's likely that the slots that it failed in are bad (which means a problem with your motherboard).
If none of the chips passed, then it's either that all the chips are bad, that the motherboard is bad, or that both are bad. To figure out which it is, you'll have to either test the chips on another, known good motherboard, or you'll have to purchase new chips and test them.
10. As always, if there's any problems with this or if you get results that you don't think agree with the testing, please post in the forums for help with resolving it.
