Hello Fazi121, thanks a lot for posting your inquire at Intel communities
For this kind of behavior, I would recommend you to follow this procedure:
- Take the motherboard out of the chassis and using only minimum configuration (board, processor, and power supply) No memory stick. Since there is no memory you should be able to get 3 beeps.
- Using 1 memory stick try to access the BIOS pressing F2.
According to you post, you are having this issue when using Windows7. Have you try installing Windows XP or a new image of Windows 7.
You may want to try another power supply and also do a clear CMOS http://www3.intel.com/cd/channel/reseller/emea/eng/membership/411560.htm