Here is one of the vintage computers in my possession. It is a Macintosh Classic II M4150. Apple considers this obsolete and " information about these products is no longer updated as of 9/1/98 "

On powering it up, It originally greeted me with a checkerboard pattern that quickly converted into this pattern. The checkerboard pattern is/was commonly caused by bad Ram memory. Considering the age of this computer, leaking capacitors are a strong possibility. Time to check.

This computer contains a CRT. That means there are some high voltages involved when working on this. Use proper CRT safety while working on it.

The cover is held in place by four (4) T-15 screws. Two (2) on the bottom