CPU/Mobo One longish beep and no display?

hey all

i just got a new gigabyte mobo mat85gm-us2h....with an amd 255 proccy corsair 450w vx all new

3 x 1 gb ddr 2 667 ram
8600 gt gphx

when i switch on the pc it makes a longesh beep and everything seems to be runing except the display no bios screen nothing

if i press the reset it still does not work....on a reboot

but if i press the shut down button it boots fine??? any suggestions on what i can do to troubleshoot...

thank you for your time
 
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