Quote Originally Posted by tistou77 View Post
If I restart it's OK but if I turn off the computer and turn off the power when I start, it's still stuck on DET RAM or IDE DECT, etc. ...

I tried to figure back to previous bios and see if it's OK
Try a different PSU. I had the same issue with ASUS Blitz Formula Mobo. After i changed the PSU I had no more problems like this.
It is simple to give this a try .