- MAC SHUTDOWN CODES FULL
- MAC SHUTDOWN CODES PRO
- MAC SHUTDOWN CODES SOFTWARE
- MAC SHUTDOWN CODES CODE
- MAC SHUTDOWN CODES FREE
MAC SHUTDOWN CODES SOFTWARE
So we pretty much had to figure out the obscure ones on our own.Ĭode 5 is a clean, user initiated software shutdown, e.g.
MAC SHUTDOWN CODES FREE
Some of the hardware shutdown codes are unique to specific models of computer depending on their configuration because they refer to a specific sensor or device that exists only in that model when I worked for Apple we were told that Intel was responsible for assigning the codes and wasn't particularly free with the information sharing on that count, even with Apple Engineering.
MAC SHUTDOWN CODES CODE
Unless you happen to connect your MagSafe adapter immediately after the computer goes to sleep, this code is pretty well guaranteed to be followed a 0 Shutdown Cause in the system.log.
MAC SHUTDOWN CODES FULL
A 0 Sleep Cause results when a MacBook/Pro/Air puts itself into SafeSleep using the last bit of reserve battery power before full system shutdown in order to preserve the contents of RAM in the /var/vm/sleepimageįile.
MAC SHUTDOWN CODES PRO
The 0 shutdown code resides in a liminal space between the hardware and the user it signifies a sudden loss of power which can either be caused by a hardware failure or user action (if you want to demonstrate this for yourself, try popping the battery out of an old MacBook or MacBook Pro while it's on and unplugged, or pulling the power cord out of an iMac while it's running, then rebooting the computer and checking Console.app. A positive code indicates a software or HID initiated shutdown, while a negative code (in the range of -1 to -127) indicates hardware-related Intel SMC-initiated shutdown.Ī -128 shutdown code indicates a hardware-related shutdown of unknown cause. They replaced the logic board (aka monther board).Starting with the advent of Intel boards, all shutdowns are tagged with an 8-bit code, if the normal software shutdown flags are not recorded. Sending in for repairĪlas, I carried the giant iMac down to a service center for repair. At least I knew I am not the only one affected. Apple forumĪpple forum didn’t provide a clear resolution. Hence, I got to bring the Mac down to a service center. The Apple support deduce that the SMC logic board might have a problem and need to be replaced. 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.
0 kommentar(er)
