Thank you! It's back working! What I did:
1) Format 2gb sd card from IREX 800sg on PC in FAT format
2) Unzipped RC3 obtained from (http://updates.irexnet.com/beta/dr800sg/
) contents to SD card
3) Put it all back into the 800sg, plugged it in, waited about 30 min. for battery to recharge and now at the "Setup- Time & Date" screen.