In this tutorial, we will explain to you the different types of beep codes (or Irregular POST) with respect to the manufacturer of that BIOS. The beep code can be different in every manufacturer’s computer. However, if something gets wrong and the computer fails the POST (testing), the computer will start generating a beep code telling the user the source of the problem. When start up your laptop, if everything is fine in POST (testing), the computer may give a single beep (maybe beep twice depending on the computer’s model) and continue the boot process. However, when the computer is on startup, POST (Power-On-Self-Test), a diagnostic (test) by BIOS, runs to determine whether all the parts of the computer are working fine or not, the computer’s internal hardware is compatible, and has a proper connection. Without BIOS, a computer can’t access its Operating System and also can’t work correctly. It is a program that the computer’s CPU uses (on boot) to start the entire computer system. While I have heard of similar issues with Macs before with dedicated graphics with a solution being to disable the card through some trickery, I cannot see such a solution with the fact this machine only has integrated graphics.BIOS, a common and mandatory thing found in every computer (Basic Input/Output System).

With this, I replaced the stock RAM with some known good RAM from an identical Mac, same issue.Īfter getting distracted from the project for about a month I came back to looking at the device and found a new issue, while using the device, horrible screen artifacts appear (Image attached, sorry for that horrible focus) and results in a full lockup and the Mac giving itself a force reset, then followed by the same beeping loop.

While this did work for a short period of time, the problem started again. After some in-depth analysis of the situation (also known as asking the Google), I found it was likely a RAM issue. I am currently in the process of repairing a friend's 13 Inch Mid 2012 MacBook Pro (Model 1278). Before I went to begin my repair, I noted that about 50% of the time, upon attempting to boot the system, the system would stay black and go into a loop of 3 beeps.

Macbook pro 3 beeps no video