Trying to reset the pram in order to fix a firewire-port-issue bot do not succeed. Press cmd-alt-p-r before the grey screen comes up and continues to press these keyes but nothing is happening. Have also treid some other start up commands but nothing happens. Have tried both a full alu keyboard and a alu-keyboard without the num pad - makes no difference. Also have maked sure that the firmwar-password is dissabled. Have a mac mini 1,83ghz 2gb ram with 10.5.8 running. Really need your help!