MSI Z77ma-g45 no powerup

my z77ma-g45 was working fine till i reseated the  heatsink now it does not seem to want to power up. I have done a full teardown and rebuild, swapped ram(8G|CRUCIAL BLS8G3D1609ES2LX0) , checked the cpu (I5 3570) in another mobo (another z77ma-g45). swapped psu. removed all addin cards and cables. no beeps no lights.... no signs of damage or burns  marks on the mobo, no bent pins (when swapped heat sinks nothing else was removed). any ideas?
edit~~~~~~~
so after working on this for two days i post here, and while waiting i decide to try one more thing, i move the cpu fan to sysfan1, and the disconnected sysfan1 to the cpu header, boom powers up.... turn it back off swap them, works again....
I choose to believe the people in this forum are wizards, and from afar fixed what ever was stopping the power on... thank you

So now everything seems to be working fine, but when you are in windows, if you leave the computer at idle it crashes?
For now, go into uefi bios and hit f6 for optimized defaults.
Hit f10 save and exit.
Once you have entered the os, open cpuz and post screen shots of the spd tabs of each memory stick installed and the memory tab. (You can open multiple instances of cpuz and take 1 screen shot.)
*When you do this the bios will default to achi mode remember.

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