The beeps indicate that your iMac is failing the Power-On Self-Test (POST)
This test checks the Mac's hardware and RAM (random access memory). It resides in the Mac's ROM (read-only memory) and runs at startup (though only from a currently shut-down Mac; it won't run if you simply restart a running Mac). If POST detects a problem, the startup sequence will probably halt almost instantly. In addition, you'll hear one of the following sounds:
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- One beep. Indicates that no RAM is installed or detected.
- Two beeps. Indicates that an incompatible RAM type is installed.
- Three beeps. Indicates that no RAM banks passed memory testing.
- Four beeps. Indicates there's a bad checksum for the remainder of the Boot ROM. (Checksum refers to a method of determining whether data is corrupt.)
- Five beeps. This means there's a bad checksum for the ROM boot block.
- One beep. Indicates that no RAM is installed or detected.
- Two beeps. Indicates that an incompatible RAM type is installed.
- Three beeps. Indicates that no RAM banks passed memory testing.
- Four beeps. Indicates there's a bad checksum for the remainder of the Boot ROM. (Checksum refers to a method of determining whether data is corrupt.)
- Five beeps. This means there's a bad checksum for the ROM boot block.
Dec 8, 2017 2:06 PM
Do you still suffer from the problem of iMac screen going black? This post will show you how to solve it.
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'I just got an iMac 20″ 2.1GHz (2006) at first it ran well no problems, but now the screen randomly goes black, the system still runs just black screen, if left alone it will go to sleep and can be awakened just fine as if nothing happened but later it's black again. any advice would be appreciated.'
iMac screen going black is a quite common malfunction when we use Macs. I have collected several high frequent scenes when the iMac screen turns black:
Scene 1. iMac screen goes black randomly, and after turning black, Mac will shut down automatically. When you restart Mac, it will get right.
Scene 2. iMac screen turns black continuously no matter how many times you restart it.
Scene 3. When you are doing something on Mac, for example, watching a movie, the screen goes black suddenly, but the system runs still in the background.
Scene 4. It is ok with turning on MacBook Pro plugging in AC adapter, however, when you unplug the power cable, the MacBook screen will immediately go black and shut down.
These four situations are not all about iMac screen changing black. But we can solve all of them with the following method.
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How to Fix iMac Screen Goes Black
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When we encounter any one of the above-mentioned situations, or others not mentioned about iMac screen going black, we can fix it with just three simple steps.
Step 1. Shut down Mac, if it is still running. And make sure that the AC adapter is connected to Mac.
Step 2. Start Mac > Press command + option + P + R simultaneously > Stop pressing after hearing open sound four times, and iMac screen will be normal.
Step 3. If step 2 does not work, don't worry, here is the other solution. You need Press shift + control + option + power button simultaneously for one or two seconds. After stop pressing four keys, push power button to start Mac, and iMac screen will not go black.
How to Fix iMac Screen Goes Black − Step 3
Bonus Tip: How to Remove Mac Junk with MacClean
It is necessary to clean computer junk regularly, no matter you are a Window computer user or a Mac computer user. Unlike remove junk in Windows, most users do not know how to clean system junk or other junk in Mac. In this tip, we recommend a safe and easy tool to solve this trouble – MacClean.
MacClean is an easy-to-use OS X optimizing tool that works on all Mac computers: MacBook, MacBook Pro/Air, iMac, Mac mini, Mac Pro, etc. It can scan your Mac to tell how many junk here in your Mac computer. And you can choose to clean System Junk, Internet Junk or other junk such as malicious cookies according to your needs. To scan your Mac, download MacClean now.
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How to Scan and Clean Mac Junk with MacClean
Step 1. Download MacClean on your Mac.
Step 2. Open up MacClean > Choose System Junk, Internet Junk or other terms according to your need > Click Scan to go.
Step 3. After scanning, MacClean will list all the junk that is ready to be removed, you can clean the .
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The Bottom Line
iMac screen going black will not bother you any more with this method step by step. And if you would also like to know how to tell if your Mac has a virus, try MacClean.
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