SOS  my hard disk has disapeared (!! or I'm going crazy)

Hi, my MacBook was on, suddenly it froze and I couldn't use the force quit settings so I force-turned it off. Then I haven't been able to start it again: It does turn on but stays on the white screen and it stays on a blinking image of a folder icon with a question mark.
I tryed to reinstall the installation disk (after having tryied the disk ultility) but it doesn't seem to detect my hard disk - when I try to reinstall I cannot choose a destination to install. Does anybody know what is going on and what I can do???

Gnosi:
Hard disk falieur does sound pretty bad... what does that mean in practice?
It means that you need to replace the drive, which, in the MacBook, is a pretty easy procedure you can do yourself. You will need to purchase a drive, remove the old drive and replace it with the new one. Then the new drive will need to be formatted and the OS installed. Hopefully you have your data backed up. If you don't it may be able to rescue some or all of it, although that depends on how serious the failure of the old HDD is.
If you are interested in replacing the drive yourself please post back for step by step directions and additional hints. Also, if you do not have your data backed up, post back for suggestions on how you might try to rescue some of it.
cornelius

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