Blank Screen And Really Loud Beep On Startup..

Hi,
2 days ago I formated my iMac and installed fresh Snow leopard, after finishing installing and going through the software update, machine restart, then i got Blank Screen and Really Loud Beep then after 20 second got the gray screen and mac start normally, but this happening now each time i start up my iMac, and it is really irratating..... I start up from snowleopard disk and check Hard disk and permission; It is ok, then I did hardware test; and result is OK,
Please Please anyone know How to get red of this....

Hi Eric,
No i didnt install anyhing or add anything; i checked Diagnostics:
Apple Hardware Test:
Last Run:          01/08/4011 21:08
Version:          3A157
Result:          Passed
Power On Self-Test:
Last Run:          02/08/2011 00:14
Result:          Passed

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