2nd incident: no workie after apple sw update

long time mac owner, but currently a frustrated one...
imac less than 6 months old, and for the 2nd time after updating sw i am unable to use the machine. first time was after a security update, and the whole disk permissions / drive errors fiasco which resulted in a fresh OS install and unfortuantely some data loss (but machine was only a few weeks in use, so no biggie). now after installing (what seems to be weekly itunes updates) machine won't start: flashing ? folder.
started from install DVD and ran disk utility: it lists the internal drive, but won't let me actually do anything to it (i.e. can't mount, verify, test, nada).
next i thought i'd just re-install and archive, but the installer can't find the drive either. ugh.
suggestions?
(sometimes i miss the good old days of system 9... did i just say that out loud?)
thanks in advance.

Good morning,
I'll pretend I didn't hear the System 9 comment...
You ran your Disk Utility from the installation CD and it does see the drive? Does it correctly identify the drive size and filesystem? If it does, that is odd, it sounds like the drive has become corrupted or unreadable for some reason, possibly a bad drive, but the fact it's seeing the drive at all makes me a bit skeptical.
You might give it a try to boot into Safe Mode and see what happens, more information and instructions can be found at http://docs.info.apple.com/article.html?artnum=107392 and http://docs.info.apple.com/article.html?artnum=107393. Might not result in much, but if it boots then we can almost count out bad hardware.
Or, if the machine is under 6 months, you might give some thought to making a Genius Bar appointment and seeing if they can give you a hint or two... (Assuming the wealth of technical knowledge here on the boards can't get it fixed first.)
Let me know if it is IDing the drive properly and if the boot to Safe Mode works...
David

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