bios keeps changing

My guess is that the CPU got too hot and may have a damaged cache causing data errors. Check the temperature in the BIOS to make sure it is running cool enough. You may try to clock it down and make sure you have a good fan. If you have a way to turn the bus down to 100MHz, you might try that temporarily, then reflash the BIOS with the latest even if it's the same version. Then you can restore the BIOS clock to normal. AMD also has a CPU ID utility that might be useful to exactly ID the CPU. Then check the Asus site for info on it's support with that board.

Try to use "default setup" in bios. This solves the problem immediately.

I'd go with #2 and run the default config...

That should work, but if it doesn't... You will want to unplug the power, and set your jumper to bypass the battery. That will clear your bios.

After that, boot up and possibly think about reflashing your BIOS, clear it again and reset it to the settings that you want.

If that doesn't work... RMA

thank's for all your replies
cleard bios, reset to default, but still the same only showing 915mhz.
even amd web site utility only shows chip as 915mgz, is the cpu dying.

Replace the battery. I don't care how old it is.

Go to Asus and get the latest bios update. Flash the bios.

When the Asus board fails boot it is suppost to go into bios automaticly. This is the overclockers failsafe.

See if this does any good and let us know.