We recommend that you remove the current memory and install ones that are supported.įour Flashes: No Memory Banks Passed Memory Testing.Įither the memory or the memory slots may need to be replaced with new ones. You should only install memory that is supported by logic board. ![]() ![]() If three flashes occur, that means that the memory that you installed is not supported by the computer system. Three Flashes: Incompatible Memory Types are Installed. If all goes well it should boot up again, but if the light still continues to flash, we suggest you contact Apple Support for assistance. If no memory is installed, then you should install them into their respective slots. In this case you should make sure that it is securely placed into the slots specified for RAM. If you already installed memory, then the problem might be with it not being secured into its slot. Two Flashes: No Memory is Installed or Detected. ![]() The number of times that the light flashes tells you what particular problem with memory you have. If your computer doesn't boot and the problem is the RAM/memory, you won't be able to hear a startup sound, and the power-on light will flash in a sequence of two, three, or four times.
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