Hello I have an IBM aptiva 1998 pentium III I have a big problem to open the case, when I unlock the back and pull the front only opens a millimeter and as much as I do force does not slide the case seems that stuck by the sides do not know if the years as if it were hard, in theory I see YouTube videos and seems easy, I do not want to pull like an animal and break something, I tried to put it upside down so that gravity does its job and also does not come out, there that comes with the same problem 😵‍💫