Hhmmm, I've never seen this before. Here's what I want you do to:
1. Unplug the system from the wall.
2. Remove the CR2032 Battery from the board.
3. Wait 15 minutes.
4. Reinstall battery.
5. Move BIOS Configuration jumper (labelled BIOS CFG) from the Normal position to the Config position.
6. Plug system back in and press power button.
This should get you into BIOS setup. If it does, make sure you do a full Restore Defaults operation and that you exit with save...
I just had another thought - this problem could be caused by a bad DIMM. have you tried using a different one?
...Scott