I have a Beige power Mac G3/233 running OS 9.1 becasue it doesn't seem to like 9.2.x About fifty percent of the time it starts up fine, but another fifty percent, it will freeze display a blank command prompt while the startup bar is about 1/8 of the way across. Even more rarely, before this, the top of the screen will be filled with the repeating message "can't OPEN" about 20 times. There are no hard disk errors with the disk utility and no PRAM resetting has solved the problem. Suggestions?