Have a HUGE problem, MacBook Pro wont boot.

Hey there so my friend just bought a used macbook pro, and is having a massive problem. The computer originally came with Tiger so we went and got Leopard installed onto it. For the first couple of weeks she had no problem until last night. She went to boot and it got stuck on the blue screen. So we tried everything, we tried starting in safe mode, tried resetting the PRAM. Then we inserted the Leopard install disk and tried to run disk utility, it wouldn't verify or repair the disk permissions, we also tried to just repair the disk which looked like it worked, then rebooted, nothing happened, still got stuck. So we went to our last resort and tried to archive and install Leopard again, it wouldn't... it said that the install failed and that we should contact support. We did that and all they told us to do was archive and install and if that failed then to bring it to the apple store. Does anyone have any other suggestions before we bring it down there?
Thanks ahead of time for your help.

Sounds like the hard drive has become seriously corrupted or is failing. Start with;
Repairing the Hard Drive and Permissions
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger and Leopard.) After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior (4.0 for Tiger, and 4.1 for Leopard) and/or TechTool Pro (4.6.1 for Leopard) to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
Assuming this doesn't work and Archive and Install doesn't work, then you need to erase the drive and install Leopard from scratch. Start with:
Extended Hard Drive Preparation
1. Boot from your OS X Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger or Leopard.)
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Set the number of partitions from the drop down menu (use 1 partition unless you wish to make more.) Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
After formatting has completed quit DU and return to the installer. Complete the OS X installation.
If this does not work then the drive may be bad and should be replaced. This can be done at an Apple service center. If the drive is out of warranty then they will charge for the service and the replacement drive.

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