Im using Asus rampage extreme iv mobo and 950w of power supply. I had adjusted "extreme tweaks" on bios from "normal profile" to "extreme gamer profile". After i save the setting restart, suddenly an appreared which is "high voltage" and "insert boot disk" appreared. Then, i restart and change the profile to "extreme profile" but the "insert boot disk error keep coming. Finally i change again to the standard which is "normal gamer profile" so my pc works fine after that. I saw that im running with 4.7GHz after switch to "normal gamer profile" and i not remember what is the default speed before i had change to "extreme gamer profile".
What i realized after that, during first time start my cpu, it looks like 2 time start up. First my cooling fan and starting sound comes around 1 secs after that the sound and the cooling fan shut it of. Again after 2 secs my cpu start as per normal. Maybe i did some wrong setting on my bios. That what i am thinking right now, Is that 2 times starting up is normal for my mobo or something else.
The double boot thing is normal. What is happening is you have made changes to the bios, these changes need to be trained to the bios. What that means is the hardware has had setting altered that need to be tested to see if they work. This is the training.
When ever you power your system down and remove the power then the system has to retain your bios once again.
To set your system back at defaults it is easy. You can do two things. One is select F5 in bios and enter to restore defaults or simply clear the CMOS using the button at the back.
To help us help you - please provide as much information about your system and the problem as possible.