The Memory Diagnostic tool is a built-in Windows utility that tests the computer's memory for defects. When the tool detects an issue, it logs an event with ID 1202. This event indicates that the memory diagnostic test has found a problem with the system's memory, which could be caused by faulty RAM, incorrect memory settings, or other hardware issues.
If you also see Event ID 1001, analyze the mini dump:
If the General tab displays this message, your RAM passed the extended test.
If you receive this error, follow these steps to isolate and fix the problem: Memory diagnostics error 1202 and 1102 - Microsoft Q&A
Open the event’s tab. Look for:
In many cases, the event text explicitly mentions a or corrected machine check (CMC) related to RAM.
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