What is the meaning of 3 long beep of Sol...

Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:''Table Normal''; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:''''; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:''Times New Roman''; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;}Since a month ago, my computer has not boot 3 times. Eachtime, with pushing power button it sounded a long beep and this sound wasrepeating every 30 seconds. Resetting computerdid not solve problem and wonderfully it was not turned off with pushing Powerbutton and I turned off it with plugging off it from electricity. Since a weekago this problem has not existed but I think it will repeat soon, due to mycomputer boot with unusual sounds that continue until a few minutes.
I did not find in themainboard user's manual about beep codes and I did not find anything aftersearching Internet for meaning of this special beep code. Please help me.