PET's sensitive?

[polishedball]

What you experience with these things is the age a factor in problems. The machine I robbed for memory to fix the Fat 40 bring it to life, is now dead all I did was pulled the memory because it was socketed to use to prove the 40 working a week or so ago. New mem came in today replaced no boot, no noise no nothing....

At least it is fun to work on.

 

[Mos6502]

I'm inclined to believe that the PET's poorly supported mainboard is inclined to break traces when flexed from actions like removing/inserting socketed ICs.

Just a theory, but it seems to go along with the touchy PETs that sometimes stop working when you move them around, but will spontaneously work again for no apparent reason later.