I was on safari working at the school library loading blackboard (school page were we keep our personal school class posts) and my MBP suddenly frose... I shut it down with the power button and to my surprise "white screen" with a *Blinking folder with question mark. I loaded the installation disk press c went to "utility disk" to try to find some errors and I ccould not see my HDD I can only see my DVD D and the DVD it self. *I figure well if it's no showing my drive it has to be a burn drive or something.*3 days latter I figure why not put my HDD on my sis MBP the same computer and all....I open my sis laptop plugged my drive and "vouala" it *loaded it up!!!! No problem what so ever...

Any guess as to what it is????* Help will be apreciated.*

Louis.M