Flashed as suggested with isa223.bin. Pc boots up. When I had a look in M/B user's manual it mentiones P6ISM. Could I get a better Bios compared to P6ISA-II which I used? Also when I tried a replacement PIII 1GHz CPU system does not boot up. Do I have to clear some settings? All CMOS settings from old bios were loaded with new one. Maybe the system was looking for 733 MHz PIII CPU?