I'm running Se440bx with PIII 500 and 256ram. I have LS-120 as primary slave and CD and CDRW as secondary IDE. The unit will work one time than will lock up the machine. If I eject the disk from the drive the computer will go back to work. If I try to restart the machine will lock at boot. If I disconnect the ribbon and the power from the 120 drive the unit will operate as if nothing is wrong. This setup has been working for about 6 months now this problem. I have the same setup running the same MB but with PIII 700. Any ideas? Jumpers on the 120 are slave and the HDD master.