PC boot problems

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Hello i need some help,

my pc (new build) does't boot, specs.

    Gigabyte GA-Z68X-UD3H-B3

    intel core i3 2120

    nvidia geforce gtx 550 ti

    kingston hyperX fury black 8 GB dual chanel

    3 psu's (i have tested)

it boots and directly shuts down (with ram)

without ram it keeps on and beeps cuntinius and after a while it shuts down

i tested 3 psu's an i bought my motherboard secondhand, (i know there working i tested them with an old pc)

i think it's the motherboard but i am not sure so i ask of it is the motherboard before

i order an new one (this is my first build)

thanks!

 

PS: i know that the memory is compitable with the motherboard

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http://linustechtips.com/main/topic/42440-readme-how-to-respond-to-a-no-post-or-no-power-up-situation/