windows locks up kernel power 41

I've been having this problem from some time now. My computer randomly locks up, it's not shutting down or going to blue screen. It just locks up and stays there until I hard reset the entire computer.

my spec.
i7 2600K not OC
mugen 2
8GB 1600 corsir
asus p8p67 reb B
ati 6950 ( 11.4)
cougar SX850W
antec 600
1TB WD black sata 3
Windows 7 Ultimate x64 build 7600
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Temps: Full load: cpu 50 C, gpu 67

Coputer is new, yesterday build and i had a ID 41 today.
Ram past a memtest
try to replace a PSU....nothing
upadte all drivers and windows...nothing

Can you help me pls?

Try these hardware tests:
- http://www.sevenforums.com/tutorials/100352-cpu-stress-test-prime95.html
- http://www.sevenforums.com/tutorials/100356-video-card-stress-test-furmark.html
- Data Lifeguard Diagnostic

nothing new, all is OK. but i can't find .dmp file? map minidump isn't in map windows

Then make sure your system is configured to create dump files.
Set MiniDump

I stil haven't get it. I can't find any mimidump or .dmp files.