Computer wont boot after long power down z77a-g45

Hi experts !
I think i need some help. I own a z77-g45, bios 2.9 + Core I5 3570K +SSD 120 Go intel + ati 7950.
I received this MB one week ago. Since, i try to make it work, no trying OC.
I began with Win8. Installations seemed fine, but after some time letting computer power down, i alwas found myself facing OS unable to boot, even when using older restoration point.
So i decide to go with win7 64 bits.
Once again, all looked like running fine, till a long power down, after that, OS refused to boot, locked on screen with colored windows logo.
I can boot in safe mode. But still couldnt find a faulty service with msconfig a dichotomic way. Os went back during the process..
What i noticed, is that after a long power down, it seems to happen something in the Bios : when the computer starts, it shuts down after one second, and then restarts again. Like if some settings were changed automatically by the motherboard. But I didn't see what the changes are.
Does that inspire someone ?
Thanks
Nicolas

I saw a similar post, where the guy changed the on board lithium battery.
I did the same, and now everything looks fine.
I also did a dual boot install : w7 x64 and w8 x64. That allows me to have access to a boot menu with the ability to easily start w8 in safe mode if needed. I noticed it can help, cause sometimes, the integrated GPU (HD4000) has some side effects.

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+{ edited to add safeboot info }+

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Quote from: BOSSKILLER on 25-March-07, 19:22:15
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Computer wont boot after long power down z77a-g45

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