when i restart from windows ME i press DEL on boot up then something goes wrong it wont boot up when i try to open the bios setup it say that the harddark MODE not USED.

HOW do i activate my harddisk. please help me tnx

There are several settings regarding HD mode and data transfer mode. HD mode are (usually) normal, large and LBA. LBA is the choice. Most systems have "auto" option that lets BIOS decide between those 3. If this setting is set wrong, you would get message like "Disk media failure" or "OS not found" etc.
Data transfer modes are usually PIO 0 - 4, MDMA, UDMA modes (33,66,100,120...) depending on the controller capacity. Wrong settings here would not manifest right away, but during extensive disk usage as data corruption, or just freezing the machine without any warning.

If you haven't changed BIOS settings for the HD, it is most likely that your HD is dead.

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