Any ideas on the cause of this red light? I had evacuated my mac out of Irma's eye and when I set it back up in my office, I was greeted with this. I know there's posts about warning lights but couldn't find one in regards to this location.
Thanks
Those Red LEDs next to each memory module light up at Startup.
During the Power-On Self Test, the LEDs on GOOD modules are turned OFF, leaving the LEDS next to BAD modules still lit.
If your Mac will start up, use:
menu > About this Mac > (system Report) > memory...
... to examine this STATIC report:
module slots showing as "Empty" (when you know they are not) have failed the test, and Mac OS will not try to use them until the next Restart, when they will be tested again (and may be brought into service despite the fact they are Bad).
Mac Pro with Xeon processor uses Error Correcting Code RAM:
User Tip: Mac Pro and Error Correcting Code RAM Memory
.
Those Red LEDs next to each memory module light up at Startup.
During the Power-On Self Test, the LEDs on GOOD modules are turned OFF, leaving the LEDS next to BAD modules still lit.
If your Mac will start up, use:
menu > About this Mac > (system Report) > memory...
... to examine this STATIC report:
module slots showing as "Empty" (when you know they are not) have failed the test, and Mac OS will not try to use them until the next Restart, when they will be tested again (and may be brought into service despite the fact they are Bad).
Mac Pro with Xeon processor uses Error Correcting Code RAM:
User Tip: Mac Pro and Error Correcting Code RAM Memory
.
Thank you Grant for the great info! Now that I know what those warning lights are for I just cleaned up and reseated the memory and all is well. When I get some time I'm going to run some diagnostics just to check but right now we're still digging out from Irma 💨🏝
On a Mac Pro with Xeon processor, memory tests increase memory traffic, but they NEVER report memory failures directly!
2012 A1289 mac pro red light
