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What does it indicate when my MacBook Pro (Retina, 15-inch, Mid 2015) running macOS 10.14.5 continually beeps on the start-up when it’s hooked up to an external monitor and keyboard but when it’s on it’s own it stays silent?
A few seconds before it was running perfectly so i sort of doubt that it has something to do unacceptable RAM.
MacBook Pro 15", macOS 10.14
Not all that unusual for problems only to exhibit themselves under power rwequirements or cabling issues.
The following table lists the new tones and their meaning:
Tone(s) Description
1 tone, a 5-second pause, repeat No RAM installed
3 successive tones, a 5-second pause, 3 successive tones RAM does not pass data integrity check
1 long tone when holding down the power button Firmware upgrade in process. See About firmware updates for Intel-based Macs for more details.
3 long tones, 3 short tones, 3 long tones Firmware restoration from CD in process. See About the Firmware Restoration CD (Intel-based Macs) for more details.
http://support.apple.com/kb/HT2538
Older meanings...
Can you count the beeps or flashes?
1 beep = no RAM installed
2 beeps = incompatible RAM types
3 beeps = no good banks
4 beeps = no good boot images in the boot ROM (and/or bad sys config block)
5 beeps = processor is not usable
In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.
Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length.
Not all that unusual for problems only to exhibit themselves under power rwequirements or cabling issues.
The following table lists the new tones and their meaning:
Tone(s) Description
1 tone, a 5-second pause, repeat No RAM installed
3 successive tones, a 5-second pause, 3 successive tones RAM does not pass data integrity check
1 long tone when holding down the power button Firmware upgrade in process. See About firmware updates for Intel-based Macs for more details.
3 long tones, 3 short tones, 3 long tones Firmware restoration from CD in process. See About the Firmware Restoration CD (Intel-based Macs) for more details.
http://support.apple.com/kb/HT2538
Older meanings...
Can you count the beeps or flashes?
1 beep = no RAM installed
2 beeps = incompatible RAM types
3 beeps = no good banks
4 beeps = no good boot images in the boot ROM (and/or bad sys config block)
5 beeps = processor is not usable
In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.
Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length.
Incredibly, I'd suspect the cable first, I've seen an amazing amount of cable issues out of the blue as well as from the gitgo.
Macbook beeping at start-up
