I have an iMac DV running OS 8.6. I recently used TechTool Pro 2.5.3 to check the HD. All segments reported okay except for the last one, which showed the “skull and crossbones.” There was mention of system file damage which its software could not repair. However, I was not able to view the whole report. I’ve had a few buggy happenings lately, but, overall, nothing really alarming. I don’t know what the damage is, but would it be a good idea to trash the system file from the System Folder, go to a backup CD, and put a duplicate of its system file in the System Folder? Placing this newer system file in the SF would re-bless the SF, wouldn’t it? (This is the first time I’ve gotten such a warning when using TechTool Pro.)