Mac wont turn on and beeps 3 times

Just to fill in to the greatanswers so far...

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.

I found this:

Here are the two most typical reasons for Mac beeping 3 times at startup:

• RAM issues: the RAM hasn’t been properly inserted or replaced.
• Physical damage: you’ve accidentally hit or dropped your Mac. Thus your RAM may have become damaged.

"Mac wont turn on and beeps 3 times: How can i fix it.. my mc wont turn on only beeps three times? Anyone can help.."

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Troubleshooting 3 Beeps on a Mac:

There is issue with the charge or power source. So, troubleshoot with the following...

Troubleshooting Mac Power:

I. Troubleshooting a Mac Beep:

Replace the charging cable that goes to the charging block. That should fix the beep. See here: Why does my macbook pro beep when charging - Apple Community

and...

II. Troublehooting Mac Charging:

A. Black Mac Screen:

Go Here: If your Mac doesn't Turn On or Start Up - Apple Support

Using External Monitors: Try Resetting the SMC and NVRAM, but this time, using an external keyboard. Connect an external monitor and see if you get an output.

B. Mac Power Issues:

Try a New Charger:

If it is currently charging from a charger, then use a new charger:

• Power & Cables - Mac Accessories - Apple - Select "Mac Compatibility" on the left
• Find the right power adapter and cable for your Mac notebook - Apple Support

C. A Few Links to Refer to Power:

• If your Mac doesn't Turn On - Apple Support

• How to Turn your Mac On or Off - Apple Support

• About Mac Notebook Batteries - Apple Support

• Charge the MacBook Pro Battery - Apple Support

• If your Mac Battery won't Charge - Apple Support

Do you have a Mac or MacBook?