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March 23rd, 2025 22:57

Problem in optiplex 990 micro

I had 3,4 led error code what that means

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March 23rd, 2025 23:13

LED code 3, 4 indicates memory issue.  Remove all memory modules and check to see if LED code changes.  Reinstall one module at a time until the code returns, that is your bad memory module.

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