The symptoms have allowed us to reach a working diagnosis, but like Gregory House MD we won’t be happy until we’ve got confirmation of the illness. How to test for bad or faulty RAM on a Mac: How to test the performance of your RAM But if it’s happening a lot, it could be evidence of faulty RAM.
Corrupt files: From time to time you will find that saved files become corrupt, and this is normal. 
Unexpected/unexplained software crashes: An application packing in can be caused by many things, but if this seems to be happening more than normal (and particularly if the crash reports show inconsistent causes) it could point to a RAM problem. If this is happening consistently, it’s worth running the test in the next section. Failure to boot: Even if there wasn’t a triple beep, failure to boot up may still indicate a RAM problem. A failed boot is always a bad sign, but the triple beep lets you know that the Mac detected a RAM issue when running its standard boot-up diagnostic check. You’ll hear three beeps instead of the usual startup come when booting up and then the system won’t boot. Triple beep on start-up: The clearest signal your Mac can give that its RAM needs to be replaced. As a general guide, look out for one or more of the following symptoms, but bear in mind that they won’t appear consistently: very often a problem will only occur when a particular part of your RAM is accessed. 
How to test for bad or faulty RAM on a Mac: Telltale signs that your RAM is faultyīad or faulty RAM makes itself known in various ways and at various times.
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