I installed a 512MB RAM card in today... and started my iBook, it registered it... more RAM.. more speed... great. Then, a few hours later (a few minues ago)... my iBook froze completely.. the time stopped, trackpad... everything. So I held the power button down... shut it down.. and turned it back on. Now, the RAM isn't recognized. Could it have possibly fell out???? If so, how? It was snapped in and recognized the first time? Also, my iBook at first didn't recognize the RAM bc it was installed wrong the first time.. so i've shut this thing down and turned it on about 3 times today... is that harmful?