i recently replaced a hitachi travelstar 30GB HD (model: IC25N030ATMR04-0) with a Fujitsu 6GB (model: MHK2060AT). the new hard drive doesn't seem to be working. when i turn on the computer the screen flashes gray twice then goes black, and the HD makes a consistant and rapid clicking sound. when i put in the old hard drive it still works, so i don't think i hurt the computer while working on it. could there be any other reason the new HD is not recognized?