My screen has gone to a very dark grey on startup.

My screen has gone to a very dark grey on startup. I can faintly make out the desktop icons, but it is about 98% black. Everything else seems to be fuctioning. Any ideas?
iMac G417" Flat Panel 17" [Pixar-lamp style]
OS 10.4

Not inexpensive, you should decide whether it's worth doing, or upgrading to a new machine, yours is no longer supported, and neither are there any new apps that will work on it.  It may be time to bite the bullet and get a new one, you can look in the Apple Store refurbished section for good deals.

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