MBP Frozen on Startup-Was reinstalling OS, lost power during a storm :(

Hey everyone,
I have a 2007 Macbook Pro that's giving me some trouble.
BACKGROUND
1. The battery on this thing is dead—in fact, it became bloated and no longer fit into the casing. Before this issue, I was using it without a battery and simply plugging it in.
2. As a result, when the power source was removed (kicked out, etc). the laptop would simply shut down.
3. As far as I know, it was running the most updated version of software prior to this incident.
ISSUE
Here's what happened:
I was updating the computer to iOS 10.5 (Snow Leopard—I bought the OS as soon as it came out, so it's an early version). It was plugged into a wall, and was about 97% finished (I kid you not) and the power went out suddenly.
Since then, it's been stuck on the grey bootup screen. I hear the bootup sound, screen goes to grey, up pops an Apple logo, the loading circle, and then...it stays there. The loading circle just chases its tail. I've tried letting it sit there for at least four hours—no change.
And to make things more interesting, the Snow Leopard CD is stuck in the optical drive.
FIXES
Here's what I've tried so far:
Fix attempt 1 (http://forums.macrumors.com/showthread.php?t=151364)
• Restart your Mac holding down "Command(the Apple key)+S" key to enter 'Single user mode'.
• Type "fsck -f", and hit return.
• Once complete type "reboot" and hit return to reboot you Mac back in to OS X as normal.
RESULT: None that I can see. Still sits on startup screen.
*OTHER INFORMATION*
I have external firewire drives, but don't have the OS installed on them for two reasons.
One, I use them as photography archives and am unsure if I would need to reformat the drive completely in order to install the OS.
Two, the CD is stuck inside the Macbook Pro.
*MY QUESTIONS*
1. What are some other fixes I can try? Please post links to pertinent threads or write below. Thanks.
2. I would like to try booting from an external hard drive. Can somebody tell me how to do this without wiping my external drives?
3. Is there a way to remove the OS install disk, like holding down a certain key combination or entering in code from Single User Mode?
Thanks everybody.
-a
Message was edited by: azraelot

First, try booting while holding down the option key. If no luck, see below.
azraelot wrote:
10.6, Snow Leopard. It's from the installation disc
The optical drive was working prior to this, because it was installing the OS just fine. It was just about finished, only 1-3% to go and that's when the power went out.
That's what I was wondering. Ok, normally I wouldn't think an SMC reset would be relevant here, but I wonder if something is different due to no battery.
Try this:
Shut down
Disconnect the power adapter from the computer
Press and hold the power button for 5 seconds
Release the power button
Reconnect the power adapter
Press the power button to turn on the computer and see if it boots
If not, repeat the process, but this time hold down the c key while booting
If not, repeat the process, but this time hold down the option key while booting

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