Emac won't start up and tech tool doesn't recognize my hard drive.

My emac's been running slow and crashing. Today it got to the point where I couldn't even use the finder when I started up. I tried to start up from tech tool and did so successfully. It recognized my hard drive and I ran the tests and repairs, but during one of the tests it got hung up. I restarted the computer and now all I get when I start up is a little folder in the middle of the screen with a question mark. I started back up from the tech tool cd, but it doesn't recognize my hard drive anymore. I'm really scared I've lost everything. I could sure use some help! The emac is running Tiger.
Jane

jamech,
Welcome to the Apple Discussions!
What version of Tech Tool where you using? If it was an older version, incompatible with OS X 10.4 Tiger, that could actualy make things worse --- see Only use Mac OS X 10.4-compatible disk utilities with Mac OS X 10.4 volumes.
The version of Disk Utility that ships with OS X 10.4.2 and higher is more capable than earlier versions. Try booting from the Tiger install disc, then open Disk Utility from the Installer menu and see if you can run Repair Disk on the hard drive. Refer to Using Disk Utility and fsck. Take note of any errors reported and post back with the results. If errors are reported repaired, re-run Repair Disk until you either get a clean bill of health or a report of unrepairable errors.
When you get the Mac running from the hard drive again, you'll need to determine why it was running slowly in the first place. Anything reported by Repair Disk is of interest here. You could try using a third-party utility such as OnyX to clear caches and logs, and to make sure the maintenance scripts are current (there's a timer in Tiger than will force the scripts to run if you normally have the Mac shut down or in system sleep overnight; the timer is based on elasped time and isn't exact).

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