By right it should continue to boot up, but it didn’t. One thing weird is that after I hear the startup sound the 2nd time, the Mac goes blank. The computer will restart and when you hear the startup sound the 2nd time, you may release. One thing new they asked me to perform is the PRAM reset.ĭuring boot up, press and hold Command + Option + P + R. PRAM Resetįinally, I called Apple support for advise. I run memtest all 2 and nothing bad turned up. That is basically a command line tools that write random data to all of the RAM and verify it is correct. Suspecting it could be a RAM that turned faulty, I run memtest. I need to power off for 1 minute instead of 20 seconds. I learnt that what I have been doing - pulling off the power plug - is the way to reset System Management Controller (SMC).įor my case, it seems a bit different. The temperatures were all okay when the system crashed. That again didn’t shed light on the cause. I installed Temperature Monitor app to log the temperature of the CPU, GPU, etc. ![]() In fact I am thinking it could be caused by the SSD or RAM. You can press and hold D while booting to perform the test.īut the test said the hardware is fine. To isolate that the problem, I tried running AHT (Apple Hardware Test). It will be Casue 5 if triggered from the menu. ![]() This gives me some clue how it gets shut off. ![]() It was said on the forum that a Cause 0 means the power was disconnected.
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