Hello!
Normally one CIA is responsible for some floppy functions, but not only: Paula, beside audio stuff, manages data transfer (if I'm not wrong - I should check schematics... it passed some time).
Anyway from the first picture it seems you have other problems there: the startup "Insert WB Disk" is broken, so I guess the problem is located elsewhere (Agnus, Denise?).
From the second picture I saw a metal clip over the Agnus chip, probably for forcing it onto socket: I never seen such thing in any Amiga 500 before.
So, since your system worked fine since some days ago and, apparently, it was quite dirty, I may suggest to check all IC contacts on the motherboard: if this system has been used/placed in a humid/dirty environment it's highly probable that the contacts between ICs and sockets are oxydated and/or dirty.
Visually check it.
You can try by removing the ICs and place them back into sockets (few times) and check Amiga behaviour (this scratches away a bit of oxyde).
If it changes, you probably have found the problem.
Of course ICs need to be extracted with some care, to prevent pin bending.
Good luck and have patience!
Luca "OgniX" \8^)
