hold down the hard power button, hwne you push it in the computer should turn on, when it turns off the pram should be reset the hard way. if that doesnt work it might be that your only other option would be to open it up and physcialy remove the pram battery(ies), it may have more than one battery, i know the pb1400 somtiems does. then waiting (with the main power supply battery and the power cord bolth removed) for like 20 minutes then setting it back up.