why is my computer beeping 3 times then stopping then 3 times again and how do i fix it??

It usually means bad RAM.

Intel-based Mac Power On Self Test RAM error beeps

Power On Self-Test Beep Definition - Part 2

3 Beeps usually indicates a RAM issue...

See Here > http://support.apple.com/kb/HT1547

If it's a new or in warranty/ApleCare machine, take it to Apple.

If not or you replaced or added RAM, then open it up and reseat the RAM firmly into the slots.

Run a extended Rember/Memtest overnight.

If the RAM is bad, then call the third party supplier for a replacement batch.

Use the free online Crucial.com checker, or download MacTracker to determine your correct RAM specifications.

Hello! This is the first time I've had a major Problem with my notebook, I hope somebody can help me.

My MacBook Pro with Snowleopard operating system, processor 2.4 GHZ Intel Core I5, apple original RAM 4GB 1067MHz DDR3 is a little bit more than 2 years old.

It started this week as my computer didn´t react to any Keyboard command and the mouse cursor was standing still. So I turn it off and soon on, then it started beeping 3 times and the screen was black. I turn it off, took the ram out and inserted it again, I clean the fans it was very dusty inside.

The next time my Mac was running as usual for about 10 minutes, suddenly the screen faded into grey, I could still see the whole background. There was a message from my computer that I had to turn the computer off with the power Button. Then the same happend again.

And today I turn it on but didn´t check on it for a while, it went into Stand by mode and I couldn´t wake it up, so I had to turn it off again.

As I turn the computer on I press cmd+v and made a screenshot of information that might contain my problem. I don´t understand what is telling me, maybe someone had the same problem and could solve it.

Thank you very much in advance,

Best

Rebecca

I'm having the exact same problem, except instead of fading to grey, I get green lines across the screen and it shakes. Did you figure out what was wrong with it? I've taken mine in but they're not sure what it is.