i dont get it.. .. Sorry,

its ur installation of windows vista have problem or ur chip got problem?

Make sure ur windows running fine first before go for overclock or unlock.

if ur windows is running fine, then unlock the chip all setting at default accept the ACC funtion.
if no boot - quickly refer to ah_khoo ..

if it was me...
set vcore to 1.30v -1.38v (monitor the temp). if no boot, start to play with 3 core, most probably u dont have all 4 healthy core. (to do this refer to bro ah_koo post & cloudwan post).
if no go... buy my mobo ....

btw, mind to let us know what is ur cpu temp when running on 550be?

http://www.xtremesystems.org/forums/showpo...99&postcount=25

http://forums.extremeoverclocking.com/atta...43&d=1246047299

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Added on December 14, 2009, 10:40 pmboth of them have the same chip & mobo as urs. mayb updating bios would help. errr.....guess so .

This post has been edited by BuckRoger: Dec 14 2009, 10:41 PM