Hi, I have a trusty old G4 Titanium. Went to use it today and the place where the power cord fits into the back of the computer and usually shows yellow or green was showing nothing. Do you think it's the power cord/source (old white brick) or something with the actual connection to the computer. Hope I am describing this ok. Hope I can fix it. Thanks in advance. Judy judy long 769 diane ave las vegas new mexico 87701 505-425-6003