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Computer components, memory and cooling

One RAM channel does not work, although both modules are good

Topic #335 · Updated · Pataisoma.lt

Troubleshooting guide

How to fix the problem

If both RAM modules individually work, but one channel does not work with either of them, it is not just the RAM that is suspect. The cause could be a socket, board tracks, CPU contacts, or a mounting problem. A consistent comparison is required.

Possible solutions

Choose the method that matches your situation. Start with the simplest suitable option and check the result. If the problem is fixed, you do not need to continue with the other methods.

  1. Comparison of modules in one slot

    First, check the modules themselves.

    Steps to follow

    1. BIOS disable EXPO / XMP if the computer starts. Turn off and disconnect the power before each RAM transfer.
    2. Find the recommended slot for one module in the board manual and insert the first module.
    3. After booting, check the quantity and memory test, then after shutting down, check the second module in the same slot.
    4. Record the results, labeling the modules A and B. If one doesn't work anywhere, check that one first.

  2. Slot and channel separation

    Use only the single module combinations allowed in the manual.

    Steps to follow

    1. Compare the sockets allowed in the manual with a known working module, always disconnecting the power before transferring.
    2. Allow the memory training to finish each time and record whether BIOS has detected the module.
    3. If both single-channel sockets are down, write down whether the problem occurred after replacing the CPU or cooler.
    4. Stop disassembly and refer to CPU socket and board diagnostics. Do not tighten the cooler when trying to restore contact.

If the problem persists

If the fault follows the entire channel, do not scrub the socket or insert metal objects into the contacts. Provide the service with a table of which module worked in which slot, as well as information on whether the processor or cooler was recently replaced.

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