I have 1.8 20inch iMac G5 running Tiger 4.11. Most of the time I sleep it when not in use.Just recently I shut it down overnight,on restarting next day the Finder went into a crashing loop every two or three minutes. I have tried a few things;Pram,Permissions,run Disc Utility,TechTool. With Finder crashing all the time my external drives keep on winking in and out. It makes things rather difficult.I have no control over the Desktop. Can any one help?