getting long (3 sec) beep, then silence (3sec) no boot nothing on screen

This is an MSI K8N Neo-F Socket 939 NVidia nForce4 ATX AMD motherboard
the CPU is an AMD Athlon 64 3800+
Memor is Corsair DDR
Primary HD Is WD740GD
Pheonix BIOS

When I start the computer, I get 3 seconds silence then 3 second beep, but no bootup and nothing on the screen.  I managed to get the computer started up a couple times, but it froze up.  Now it won't start at all.
rdavesAsked:
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willcompCommented:
Long beeps spaced well apart have mostly indicated memory problems in my experience. Reseating memory usually resolves the problem. I don't recall one where PC would boot sometimes and sometimes not.
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PUNKYCommented:
http://www.computerhope.com/beep.htm
What beep you have in the link above?
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rdavesAuthor Commented:
I have alaready gone to that link.  The beep I am getting isn't listed under Pheonix beep codes.
I just got the computer started again.  About 10-minutes ago, I got what looked like a power loss and the computer rebooted.  It has been up for a few minutes now and is running fine   I will report on any problems later on.
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rdavesAuthor Commented:
I will mention here, that all this started right after an Itunes update.
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nobusCommented:
a long beep indicates problems with video card in most cases
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lauchangkwangCommented:
suggest to try to run the memory test:
http://www.memtest.org/

agree with willcomp, sometime reseating the RAM will solved the problem ....... can try to run the memory test with 1 RAM, after tested ok, then change another 1 to test out (not recommend to test 2 RAM together if you got 2 inside, this will just make you don't know which 1 of RAM is causing the problem if really the RAM issue)

Hope this help .....
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rdavesAuthor Commented:
I have two memory cards on this computer.  I removed the card in slot 1 and moved the card that was in slot 4 to 1.  Computer started up fine.  then I put the other card in slot 1 and got the beeps...bad memory.
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