No Signal from onboard HDMI

i bought motherboard from Gigabyte ..

it is GA-H55M-D2H

http://www.gigabyte.pl/images/products/2144/b888.jpg

as you can see .. there are many onboard ports like (VGA - DVI - HDMI)

when i installed the processor & rams and power … tried to power on the pc

and connect the HDMI cable with my “HD LCD”

but no signal comes on the screen … with two fast beeps

i tried the onboard VGA port too … but the same .. NO signal

i put external vga to see Bios setting .. but there are no mention to onboard graphics

i tried to update the bios via @BIOS software that comes with motherboard

but nothing ..

what i should do to use onboard HDMi or VGA

Try resetting your CMOS. To do this, take out the silver 3V battery on your motherboard. Wait a few minutes and then place it back in. This will reset your CMOS.
And do you see anything on the screen when plugged in to VGA or HDMI?