hi all i'm new to this site i bought an ibook g3 500mhz from ebay when it arrived it was in pieces with the fan removed i reassembled it and it works but after about ten minuets the screen goes corupt i booted it with the bottom detached and it worked perfectly and i watched a full dvd but i noticed the fan didnt spin all the time the base was off and i've never heard it spin when it was all together would a new fan cure this or is the logic board no good any help would be much appreciated