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The two short beeps are probably a POST (Power On Self Test) code. These have been in use since the first PC was manufactured by IBM, and other manufacturers decided to let IBM's POST codes be the standard for PC clones for several years. AMI, a BIOS chip manufacturer later came up with their own. Since then other manufacturers have strayed form the IBM fold, also.
For more info, go to <a href="http://en.wikipedia.org/wiki/Power-on_self-test">http://en.wikipedia.org/wiki/Power-on_self-test</a>.
Your 2 beeps in IBM POST code mean: POST error, see code on screen (code 123 means "system board error"). Not a lot of help!
Your 2 beeps in AMI BIOS POST code means a Base Memory Parity Error (bad memory chip in lower 64k of RAM).
The 123 display on the tower may NOT be the IBM POST error code, but something else. As reets-tech implies, you probably will only be able to get a definitive interpretation from your computer's manufacturer or one of their authorized repair facilities (if any). Good luck!
