Weird Problems, Hard Disk icon dissapears and more

When i startup my computer, my hard disk icon dissapears. I have been to another website and i can use applescript and enter this :
tell application "System Events"
set visible of disk "NameofDisk" to true
end tell
tell application "Finder" to quit
delay 1
tell application "Finder" to launch
well this all works find and dandy but once i shut down the computer and start back up it dissapears again.
and also when i start my computer it asks for the keychain password, i enter it and it goes away. but it comes back up every time i login to my account. i have had these issues since i have installed in on my laptop. no issues at all on my mirror drive 1.25ghz g4.
ANy ideas???
help help

anyone got any ideas??

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