yo my comp is open 24/7 if u know what u are doing then your fine if u are ignorent or clumsy or are not in a safe environment (as in babies around) then just take it somewhere else and open it . i have a 300 PII i have taken it out inspected it put on more fans to it and it still works fine. they are quality made, they are not gonna explode just because your holding it. Just dont try putting magnets too it , Use common sense