Does that mean my hard drive is dead? IF YES, IS there a way to Backup all my folder from the hard drive?
backup is for before the drive brakes not after. You're into data recovery now.
Do not attempt to load data onto the drive. Some of these utilities will require a working drive. A PPC computer requires a firewire drive. There are 800 firewire to 400 firewire adapters if needed. You may want to think about professional data recovery.
http://eshop.macsales.com/shop/firewire/1394/USB/EliteAL/eSATA_FW800_FW400_USB
I think Disk Warrior will be your best chance.
Perhaps Disk Warrior will be of some help:
http://www.alsoft.com/DiskWarrior/
"Stellar Phoenix Macintosh - Mac data recovery software, recovers data from damaged, deleted, or corrupted volumes and even from initialized disks."
They have a trial version, so I guess you can see if your data can be recovered...
http://www.stellarinfo.com/mac-data-recovery.htm
"Data Rescue II is the best data recovery software on the market for recovering files from a problem hard drive. Data Rescue II works when other tools fail. Data Rescue II is also completely safe to use since it does not attempt any risky repairs to the drive while its scanning."
http://www.prosofteng.com/products/data_rescue.php
FileSalvage is an extremely powerful Macintosh application for exploring and recovering deleted files from a drive or volume. FileSalvage is designed to restore files that have:
-- been accidentally deleted.
-- become unreadable due to media faults.
-- been stored on a drive before it was re-initialized/formatted.
http://subrosasoft.com/OSXSoftware/index.php?main_page=product_info&products_id= 1
"TestDisk is a free data recovery utility. It was primarily designed to help recover lost data storage partitions and/or make non-booting disks bootable again when these symptoms are caused by faulty software, certain types of viruses or human error (such as accidentally erasing a partition table)."
http://en.wikipedia.org/wiki/TestDisk
Wondershare Data Recovery for Mac
"Recover lost photos, video, documents, email and archive files from any Mac-based hard drive or external hard drive, iPod, USB drive, SD card, digital camera, mobile phone, and MP3/MP4 player, due to accidental deleting, formatting, virus infection, improper operation, unexpected power failure, and other unknown reasons. Also, iPhone recovery allows you to recover lost photos, videos, SMS, contacts, note, calendar and call history from iTunes backup file. With the free trial, you can preview all your recovered images, videos, music, documents and archive files prior purchasing this Mac Data Recovery."
http://software.bigbigsoft.com/data-recovery-mac