Anyone experienced this problem with Exermax Galaxy PSU 1000W and Asus R3E?

http://www.youtube.com/watch?v=TGSnBwbarHk

This is what happens:

1. I press start on my motherboard.
2. PSU starts beeping.
3. I switch the PSU off, and wait until all power is gone.
4. Switch the PSU on again, and press start.
5. Computer boots up normally.