|If it does not show up in BIOS set up that typically means the drive is bad, but trying a different power and signal cable is worth the time. If it also does not work on a desktop as a second hard drive, assuming you are using a different signal cable and the power cable would have to be from the desktop's power supply, then you can be pretty sure that the drive is dead. |
You will need a Recovery Disk Set from the system manufacturer in order to reload your operating system or a new retail Windows 7 install disk w/key. The recovery disk set will probably cost you some (depending on the mfg) but much less than an install disk w/key. If it is by any chance it is under warranty then the manufacturer should at least supply you with replacement drive and recovery software, unless you want them to do the repair (or they insist on it).
You have to be a little bit crazy to keep you from going insane.