HELP: macbook won't boot past the apple logo, tried numbers of methods all to no avail

Hello all, this afternoon my macbook (MBW 7.1, Lion) won't get past the apple logo with the rotating stuff and the loading bar stuff underneath the logo.

Here's several troubleshoots i have done for the past 6 hours:

• i tried to boot while holding cmd+F, cmd+S, Shift key, etc but all to no avail.
• i went to the black screen where you can do the "fsck -fy" thing yet still to no avail (fyi the screen said that my disk could not be repaired; tried the fsck for a couple of times more still ended with the same result).
• I also tried inserting OSX disk (which is from my previous MBW 6.1 Snow Leopard, i bought the 7.1 secondhanded preinstalled with Lion from its previous owner) but after a couple of minutes, the screen shows the "You need to restart to computer..." sentence – those written in 5 languages.

I hope anyone would help me and the rest of those who still encounters the same problem with no avail, by replying to this thread.

Should anyone suggesting me to go straight to the service center (in my place we only have reseller stores which also do hardware fixing), I WILL, take my MBW to the service center but not in the near future (as it is sadly not available in in my city so i have to schedule the visit only in weekends probably) but by starting up this discussion, i only hope for any alternatives that can probably be done by myself without having to go to the service center (which hopefully saves me a LOT of money as well 🙂)

Thank you very much!