On startup only blue screen w/sm folder & finder icon in center
iMac G5 17" EMC No. 2055 early 2005
After powering on, this iMac only displays a blue screen with a small folder icon with the finder icon superimposed in the center of the screen. No startup chime. After a few minutes the fans kick on and don't stop. Sometimes (not often) the finder icon disappears and a question mark appears briefly before going back to the finder icon. What does this all mean?