just re-read the OP. Are you not even seeing the Windows splash screen? If so then you won't be able to boot into safe mode. Either way, you can double check and make sure you hit F8 early enough. It doesn't hurt to repeatedly hit the button after the computer posts.
The original Windows 7 install disk is also a recovery disk. If you don't have one, then the only easy way I know to get one is ask someone else who has a working copy of Windows 7 to either create one or borrow their Windows 7 install disk. I don't know anywhere to DL one.
One thing to test (if you can't get your hands on a Win 7 disk soon) is to see if you can boot to a CD/DVD or USB drive. If you can boot to those then we know it is a HDD/Win7 problem. I'm sorta concerned that it is something besides Win7 if it isn't showing the Windows splash screen.