Well, it is hard to say what the issue is exactly. What I would try next is to enter the BIOS setup. According to your first post, you acheive this by pressing F10 at bootup. First I would want to know if the BIOS can see the hard drive. Then I look for "Load Default Settings". Tell it to load the default settings and exit BIOS saving the new settings, and then reboot and see if anything different happens.
If no joy, you could always remove the hard drive and install it in another computer as a 'slave' drive. The working computer should still boot up from the 'good' Master hard drive, and then you will be able to navigate (Start > My Computer
) to the slave drive and recover your data. More info on how to install a second drive can be found HERE
You could always look around on eBay or elsewhere for recovery disks. They can usually be purchased from the manufacturer fairly inexpensively, but they are not always available. Like I said, sometimes they will be for sale on eBay. You need the recovery disks to get to the next troubleshooting/repair step (unless someone else here at Bleeping Computer has a different idea).