![]() Sometimes, as in this video, its an easy DIY job to resolve. If it eventually chimes or beeps then you can start reconnecting components, knowing that once you connect something and stops working then you have found the failure. Old MacBook Pro stuff today, the three beeps on boot are a generic memory error. Sometimes, as in this video, it's an easy DIY job to resolve. If this is the case then you can try disconnecting components (hard drive, optical drive, display, etc) and then powering on again. 132K views 3 years ago Apple Stuff Old MacBook Pro stuff today, the three beeps on boot are a generic memory error. This tells us that it's not progressing past the early stages of the boot process. Press the power button to turn on the Macģ) If you remove both RAM DIMMs and attempt to power on the Mac does it beep (different from the normal chime) at all or is it just a black screen with with only the fan spinning? If the Mac doesn't beep then it's failing to recognize that no RAM is installed, which it checks during it's boot process.Release the power button and all of the keys at the same time.Hold the (left) Shift, Control and Option keys and press the power button for 3-5 seconds.Connect your power adapter to your computer and ensure that your Mac is turned off.You can do this using the following steps, you might see the power adapters LED change color during the process. I have built 3 systems prior to replacing my MBP RAM and still expect the RAM to need reseated. ![]() New RAM was not seated correctly - not a crime or a fault. If it turns out the new modules do not solve the problem, return them for a refund. You can either try removing one module at a time to see if that helps, or purchase two new modules to replace those in the machine. Reinstall the old RAM and see if it starts. The only positive way to test memory modules is by substitution with known good ones. ![]() A lot of odd issues can come back to a faulty SMC state, which are often resolved by resetting it. Possible reasons and fixes: New RAM is bad, while old RAM worked. This would be my approach to the problem.ġ) I would attempt to remove the RAM and inspect the RAM slots on the logic board, using compressed air and/or a small pick if debris is visible.Ģ) Reset the SMC. My first thought with this would be faulty RAM or possible debris in the RAM slots on the logic board.
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