Macbook Pro, one beep every 3 seconds.

Hi,
All of a sudden getting one beep every 3 seconds. Reseated the RAM, ried each module alone and reset the PRAM. Any help is appreciated.
Pat

Hello Patrick Campagnone,
Go through the below link as according to the below Apple Support kb " 1 tone, repeating every 5 seconds: This indicates no RAM is installed".
http://support.apple.com/kb/HT5860?viewlocale=en_US
If you have an option then also try Interchanging the Ram to a different port as well from where it is currently placed and still if the issue persist as you have already tried with one Ram at a time then the best option would be take a Genius Bar Appointmennt and get your Macbook Checked.

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Hello, I hope someone can help me
Out of the nothing my computer crashed. There was a blue screen, but only for a split second, so I couldn’t get any information from that. After I tried to turn it back on I only got a black screen.
Messages from my PC:
One beep every few seconds. -- Means: DRAM refresh failure.
The LEDs on the board have the combination red-red-green-green. -- Means: Decompressing BIOS Image to RAM for fast booting.
Obviously I tried another RAM module. But it didn’t help. I don’t know what I should do, because I can’t even get to the BIOS. The screen just stays black.
PS: I didn’t OC or try to flash a new Bios version.
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Okay, please have a look at this document:
http://www.ami.com/support/doc/AMIBIOS8_Checkpoint_and_Beep_Code_List_PUB.pdf
As you can see, there are two main routines going on after you hit the power-on button:
1. Bootblock Initialization
__ and __
2. POST Code
Your problem description ...
Quote
The LEDs on the board have the combination red-red-green-green. -- Means: Decompressing BIOS Image to RAM for fast booting.
... indicates that your system halts in the first of the two main routines I just mentioned. To be more precise, it hangs at Bootblock Initialization Checkpoint D5, which is defined as follows:
Quote
Bootblock code is copied from ROM to lower system memory and control is given to it. BIOS now executes out of RAM. Copies compressed boot block code to memory in right segments. Copies BIOS from ROM to RAM for faster access. Performs main BIOS checksum and updates recovery status accordingly.
In the last two phases of this checkpoint:
Quote
Copies BIOS from ROM to RAM for faster access. Performs main BIOS checksum and updates recovery status accordingly.
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Quote
One beep every few seconds. -- Means: DRAM refresh failure.
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Quote
Boot Block Beep Codes
Number of Beeps -- Description
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4 -- Flash Programming successful
5 -- File read error
7 -- No Flash EPROM detected
10 -- Flash Erase error
11 -- Flash Program error
12 --‘AMIBOOT.ROM’ file size error
13 -- BIOS ROM image mismatch (file layout does not match image present in flash device)
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Quote
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Regards
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Macbook Pro, one beep every 3 seconds.

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