Failed Leopard Installation, now Tiger wont boot

I recently tried to install Leopard onto my MacBook and during installation an error message came up talking about running a preupgrade script and it told me to contact tech support. so i tried to quit the installation and reboot normally but when I clicked on Quit Installation the spinning pinwheel came up and stayed like that for over an hour. So I restarted with the power button.
It started to load like normal (the chime, gray screen w/apple, etc.) but then it went to a black screen with white text where you enter commands (reminds me of MS DOS). What do I do? I need any help I can get! Thanks.

Scott,
thank you so much for your help. but looks like it is my HD afterall ):
...somehow leopard installation revealed a "boot" problem....or created it?
as an alternative to getting the install disc in: Applecare told me to hold option key down after turning on the mac, mac HD symbol did appear so then I could insert the install disc, selected it and went to disk utilities:
He suggested I partition the drive first, to repartition it back together later, before trying a last resort of zeroing the drive which would take a long time.
When partitioning failed because it said "resource busy" and then first attempt to erase HD selecting the one with numbers failed with the same "resource busy" 3rd attempt to erase Mac HD did work.
however this tier 2 applecore person was concerned that even if I zeroed the drive there was something wrong with my "boot" and then after confirming with me I didn't have boot camp installed, told me my Macbook pro needed to be sent in for the HD to be replaced.
since having enough GB is my main problem (with final cut installed) I have a related question:
To add GB with a new HD? since mine is only a 100 GB?
I was told authorized apple dealer can do this (but not apple) and applecare will still cover me (except for the bigger HD itself)
do you think it advisable to go for more GB?
for the next 2 months, I need my macbookpro for work so I am tempted to let apple replace this 100gb HD and do it later when I am going on vacation
Also JUST TO BE ABSOLUTELY SURE this leopard works and there aren't any other problems with my laptop and apple can't blame me and my buying a new bigger HD...
(: silver lining is that now apple will install leopard for me! yeah I think!
do I want this leopard afterall? or wait for a cheta or whatever is next!
thanks again!

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MDew1:
Please try the following:
1. Boot into Leopard as you do with holding down the Option Key.
2. In Leopard go to *System Preferences*
3. Under System select *Startup Disk*
4. Highlight *Mac HD* and Restart
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Read what you wrote and clarify it. You got the replacement disk? Yes or no. Yes the installer disk is a bootable disk. How else did you try to install Leopard?

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http://www.ebay.com/sch/i.html?_nkw=mac+os+x+leopard+retail+10.5
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http://sourceforge.net/projects/leopardassist/
http://lowendmac.com/osx/leopard/unsupported.html
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http://guides.macrumors.com/List:Applications_Not_Compatible_with_Leopard

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Failed Leopard Installation, now Tiger wont boot

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