Also try the basics, use a different sata cable, power cable, sata port.
Check if it's detected in the BIOS. If not, then it could be dead
Can you hear or feel the drive motor or platters spinning? Does it get warm?
If you can see it in the BIOS and WD Tools doesn't help, try "Ultimate Boot CD" and boot from this.
In the menu select "MHDD" and run this.
You can then run a low level test for bad bits / sectors & mark them bad.
The beauty of MHDD is that it will also test the access time and if it's very high, it will mark it bad.
Windows and other tools only check if the bits can be read, but if the OS thinks it takes to long to read it internally marks it as bad. You may loose some data doing this, but it will restore the drive back to "as new".
If the drive platters are seriously damaged it may still run, but you could be left with a much small hdd in the end.
If it's not detected by MHDD, try again but before you start MHDD the second time; on the menu press TAB first and type "raw" and press enter.
Dell Laptop | 2GB | Core2 1.6GHz | OCZ Vertex 60GB | x1400 | Arch Linux x86-64
The Arch Way