You're Abit BD7II-RAID MB has many bios settings that could bring about the sound you are hearing.
See page 3-23 in you're manual. (Resume by Alarm)
Most of the settings on page 3-23 are used for power savings. Also see page 2-10 section (13). U27: POST Code Display. When you hear the alarm tone check the MB's display U27 for it's code.
I'll post a site where you can download a small program called Speccy that can monitor the temps in you're system;
http://www.piriform.com/speccy/download
This can help if there is a heat problem with a device within you're system. At this time I don't feel you have a CPU problem.
Good luck!
Mike
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