i had my g3 for 2 years now no probelms soo last nite i wanted to clean my whole computer i put in the cd's and cleaned my whole harddrive it would give me some black screen with something saying code error then when i restrted my pc grey screen with teh question mark box blinking i took it to a pc shop they said it's the memory is shot can someone please help me on what to do do i need a new memory or should i take it to a apple service centre