Random shut down and sometimes no screen

[zniff]

hi.
im having a problem with a new build.

parts:
AMD Phenom II X4 965 Black Edition
http://www.komplett.no/k/ki.aspx?sku=518692#extra
ASUS M4A87TD EVO, Socket-AM3
http://www.komplett.no/k/ki.aspx?sku=593889
Corsair Dominator DHX DDR3 1600MHz 8GB
http://www.komplett.no/k/ki.aspx?sku=597381#reviews

wondering if there are any known possible problems i should know about, or hints to any possible traps.

 

[zniff]

XFX Radeon HD 5770 1GB GDDR5 is also in the mix