When I power on my PC, the fans will start as normal for around 3 seconds, before shutting down. This happens twice, before it will start booting up normally.
I got a Asus Rampage Extreme II motherboard, and this started happening after I updated to the latest BIOS driver (version 2101).
Something similar also happens after attempting to wake the machine from sleep. The fans will start up and shut down twice. The exception here is thought, that it will never go into the OS (win7). The fans will just keep spinning (at rather high frequency), but nothing happens. The only way to get out of this, is to completely shut down and restart the machine.