MBP Does Not Boot.

After attempting to install Leopard on my MBP, it told me i could not complete the installation because on an error (i have no idea what). So i restarted the machine and tried to do it again. The icon representing my Macintosh HD had a /!\ triangular symbol over it, and i could not perform the installation. I thought, oh well i'll continue with Tiger and back up all my things then try again later, only to find that when i restarted my machine that after the grey screen with the apple comes up and the swirly, the screen goes black and it stayed that way for a while.. i wondered what was wrong. i held the power button in til it restarted again but when it did it made a very nasty loud BEEP!
every time i turn it on it goes no further than blackness after the apple screen. the reason for the black screen is because the mac is switched off. very strange. If i insert either my leopard boot disc, or my tiger boot disc and hold the C button it will load them up. After researching another topic, i have ran the disk utility whilst in the tiger boot disc (because i do not want to lose all my files). My HD is "verified", and when i click on Repair Disk, every time it displays these details:
Verify and Repair disk "Macintosh HD"
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Invalid node structure.
Rebuilding Catalog B-tree.
The volume Macintosh HD could not be repaired.
Error: The underlying task reported failure on exit.
1 HFS volume checked
1 volume could not be repaired because of an error
Repair attempt on 1 volume
1 volume could not be repaired
then a pop up message displays to me:
First Aid Failed
Disk Utility stopped repairing "Macintosh HD" because the following error was encountered:
The underlying task reported failure on exit
all i can ask is... any help????

Right now you have hard drive issues. Probably directory problems. Whether or not your hard drive can be repaired and boot from Tiger again is another issue. Hopefully you backed up all your files prior to the attempt to install Leopard. You have some options:
1. In as much as the Tiger install disk can't repair the disk you might try DiskWarrior. No guarantee.
2. Do an Erase & Install with your Leopard installer disk. (As I mentioned, hopefully you are backed up). You could try using another Mac and connect both using firewire cables and boot your Mac into target disk mode. If your hard drive shows up on the desktop of the other Mac you may be able to get your files that way.

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Hi, thanks for the input.
I produced recovery media with the built in recovery media creator, and with ATI Home 2013. This was in the form of a usb flash drive for both types, and a cd as well in the case of ATI2013.
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That sounds very encouraging. I was once able to get it into target disk mode as well, but I can't remember whether it was with the startup DVD in it or not. With the startup disk I can do all the technical check stuff, except anything that requires me to use the HD, which the MBP does not recognize anymore. Can you describe more in detail what steps you took to get it into target disk mode, I mean sequence of events: first connect the two MBPs by Firewire, then start the second MBP, then the first one in Target Mode by holding T when starting up - or in another sequence?
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