3 beeps on intel DH55HC board

my new intel mobo DH55HC is giving 3 beeps and not displaying anything...

i have installed core i5 760 , 2 gb ddr3 ram , ati radeon 5750 on it... and still the issue goes on when i changed the ram stick , as well as another DH55HC motherboard and another ram module too..

i have googled it and the search told me that i have to reset the bios of the new board by taking out the battery for few minutes and then placing it back on and also a JUMPER for CMOS.

can anyone help me regarding all this ? i have also checked the board / processor compatibility on intel seite.and they are 100% compatible with each other.

am waiting for more suggestions. plz

was it working ok and giving display before this problem???

3 beeps are usually bad or missing RAM. Maybe the RAM socket is damaged or has something sticky inside.