Purchased a used Blue and White Yosemite power mac g3 400mhz with 12g HD. Has OS X jaguar installed. Worked fine the first few days but now is not bootign up. It turns on and there is power but nothing else happens. The monitor just has its defaul screen. Every 10th try or so it will boot up like normal. When it does boot up normally the screen displays a file and question mark a few time until OS loads. Does this mean anything? My powerbook did this when my HD went so I am a little concerned.