Before you go much farther you might consider testing the hard drive using Seatools or the like, I'd hate for you to get everything up and going only to find the hard drive is failing. As for advice...

OK we'll be around to help, post us on if it fixes it or not and be sure to mark thread solved at the end - it helps other people in similar circumstances to sometime be able to see a completed...

Well at this point it is most likely that you a bad hard drive, we can try a recovery of the drive but I don't think it will work at all. After that the choices you have are is you want to first try...

Data cable - the wide cable that connects between the drive and the motherboard

Optical Drive - CD or DVD drive using a laser and lens to read data

Jumper - a small block that spans 2 or more...

OK, since you have changed boot priority and it isn't seeing the Hard drive - which is otherwise detected in BIOS, you likely have a problem with a cable, a controller or the hard drive. The cable...

Next step should be to go look and see if it detects the hard drives, and make sure the boot order has the hard drive at the top. Generally this is in one of the following generally: system...

When the machine first starts up you should try the various common keys for entering BIOS even before you see anything, especially if you have an LCD monitor as these often don't show the initial...

Actually, I think the first thing you should do is to check in BIOS what the boot order is set to. This is probably an instance where something is in the optical drive or that the boot order has...