people, my macbook was experiencing some issues over the last few weeks regarding the now imfamous Random Shutdown....but its was left on until the firmware was released to fix it... now its doing my head in!! pressing the power button to go thru the firmware completion deos nothing but flash the power button a few times, and leave the CD Drive in a cycled clicking sound.....no screen comes on at any time... anyone help?? is there a way to reset the PSU on the macbook just like the iMac?? got really important stuff on here that needs working on this week!! help very very gratefull, im heading to the apple certified repairstire tomrrow with it anyway..