White screen and "question" sign? Disk fail?

Hi there! After some hanging i switched of my iMac manually. Trying to restart then i've got a white screen with a blinking guestion letter on a folder icon... ^( Does it mean i've lost my startup disk? Or what? Tryed to restart from system CD (10.6) but disk utility shows no hard disk, but installation CD and somewhat called "media" - unformated with zero capacity... Some ideas?

The blinking question mark means your Mac can't find a valid OS on any attached disk to start from. Together with what Disk Utility shows, this is quite possibly a sign that the startup disk has failed. (This may be what caused the crash.)
However, I'm not sure what "media" might be. In Disk Utility, you can highlight it & press Command + i to get info about it. One of the items of info should be its "Disk Identifier." If that has an "s" in it (like "disk0s2") it is a partition on a drive; if not (like "disk0") it is an entire drive. If there is no "Disk Identifier" entry at all, it is something other than a drive or partition.
If it appears to be an entire drive, it may be the one containing the startup disk (IOW, your internal drive). This may mean that the drive has not failed, but only that its partition scheme info has become corrupted. If so, you can select it, switch to to Disk Utility 's "Partition" tab, reformat the drive, & restore it to a useable state. Note that this will erase anything on it, so if you do not have a backup you may want not to do this until you see if a data recovery utility (like Data Rescue II) can save any or all of your files.

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