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MacBook Pro won't power up!

I have a MacBook Pro that is about 9-10 years old. It's been working ok until I let the battery run down during covid. Now it will not power up. When I push the power button, it begins beeping 3 beeps then stops for 3 counts then 3 beeps again continuously. If I attach the power cord the beeping also begins without pushing the power button. I tried holding the power button for 10 seconds then holding the left side shift, control and option buttons for 10 seconds to no avail - more beeping. Suggestions? Julie

Posted on Oct 9, 2020 10:45 AM

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Posted on Oct 9, 2020 4:49 PM

The three beeps indicates a memory issue. Many times the memory slot nearest the bottom case fails due to bad solder joints, but the other memory slot can sometimes fail although it is much more rare. You can try reseating the memory since the latches holding the memory in place sometimes will pop loose. If this doesn't help, then try using just a single stick of memory. Try that single stick in both slots. Then try the other memory stick by itself in both slots. See if you can determine which memory stick or slot is bad. It is rare for both memory modules to fail.


Make sure to disconnect both the power adapter and battery whenever inserting or removing parts like memory.


You may want to try disconnecting the battery and powering the laptop on with just the charger. I have seen the sleep LED blink with some types of battery failures. I don't recall if the system beeps when this happens. Have you been able to charge the battery (check the battery indicator lights on the side of the laptop to see if more than one LED lights up).


FYI, never let the battery remain completely discharged for any length of time as it can cause permanent damage to the battery. A completely discharged battery can also prevent a Mac from powering on.

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Question marked as Top-ranking reply

Oct 9, 2020 4:49 PM in response to jcd348

The three beeps indicates a memory issue. Many times the memory slot nearest the bottom case fails due to bad solder joints, but the other memory slot can sometimes fail although it is much more rare. You can try reseating the memory since the latches holding the memory in place sometimes will pop loose. If this doesn't help, then try using just a single stick of memory. Try that single stick in both slots. Then try the other memory stick by itself in both slots. See if you can determine which memory stick or slot is bad. It is rare for both memory modules to fail.


Make sure to disconnect both the power adapter and battery whenever inserting or removing parts like memory.


You may want to try disconnecting the battery and powering the laptop on with just the charger. I have seen the sleep LED blink with some types of battery failures. I don't recall if the system beeps when this happens. Have you been able to charge the battery (check the battery indicator lights on the side of the laptop to see if more than one LED lights up).


FYI, never let the battery remain completely discharged for any length of time as it can cause permanent damage to the battery. A completely discharged battery can also prevent a Mac from powering on.

Oct 13, 2020 6:46 PM in response to jcd348

That is up to you if you need the memory to adequately run the laptop. Only you can decide if it is worth spending money on such an older system. Macs are very picky about the memory they use so it is best to only purchase memory from Crucial or OWC using the tools on their respective websites to get the exact part numbers which are compatible. A Mac can run just fine on a single stick of memory (usually you want a minimum of 4GB of RAM installed).

MacBook Pro won't power up!

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