To reset it. you take the ccmos1 pin.Should have 3 pin's.Should be on 1 and 2 pins for normal setting and 2 and 3 to reset.Worst that can happen from resetting is you might have to reset some things in your bio's.
To flash your bio's basicaly you format a disc and make it a DoS bootable Disk and load up your bio's fromyour mother broad manufacter.Should be explained at your boards site. If during flashing your computer crashes or turns off. You will have a paper weight for a mother broad.If you dont put the right bio's on your disk .You can wreck your mother board.It is really easy to do and really easy to mess up.Even your motherboard just like a microsoft update has up dates.
Here is mine for example.I have a Abit BW7.To do the flash i need to do this
This is the bios i need to install on the floppy i made.
Try to reset bios first maybe its some temp command that got accidently switched to low.resetting should set everthing back to default.
If you flash make sure you do it right cause you get one shot. Did i mention that you can really mess up your board doing this.
This may not be your fix. Could be lots of differnt stuff.
If you got a warranty still good or tech support have them walk you through it. So if something bad happens you can get a new board.Some newer boards can be done with a CD.
Bah and a gimpy definition of what a bios is.When you first start your puter .Your bios tells it how to start up and what needs to be turned on and off.How much electricity is neeeded.What irq things should be on.A hardware controler for your motherboard.