I have an Asus K8V motherboard that I've recently started using its RAID capabilities. I'm using the latest bios. Every so often when I boot, it "forgets" that it should be booting from the RAID array ...
Then click Change settings that are currently unavailable ... Restart your PC and tap the key shown on screen (often F2, Delete, or Esc) to enter the BIOS. Once there, look for a menu called Boot ...
If you're anything like me, you really only touch the BIOS if you've just put together a new system, or you're upgrading parts to an existing one. A quick tour of changing a handful of the usual ...