beeping Sony Vaio desktop!

  Jabba10 22:30 23 Mar 2005

My Sony Vaio desktop computer (Athlon XP2800+) occasionally starts to beep with the sony sign on the box starting to flash. It stops after about 30 seconds and everything works fine on the computer while this is going on.

Can anyone enlighten me as to what is going on?

Thanks in advance

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