i've been having this issue for the past few days where a black box appears around all kinds of things, seemingly randomly, and they don't show up in screenshots... what is going on here??

ok im trying to figure out exactly what my options are for replacing the processor in a mac mini core duo (not core "2" duo) - i've seen different references on different sites but i was hoping somebody could tell me exactly what to look for

if anyone has done it before it would also be nice to ...