Single-User Mode Copying Files/System Does not Boot Past Apple Logo Screen

I have a Macbook 2.0GHZ, 2GB RAM, that recently tried to download a secuirty and keynot update. Following the download the system will no longer boot past the Apple Logo Screen with the spinning wheel. I do not have access to a OS disk yet or to a firewire cable either. I've have seen posts from others that describe how to use traget disk mode to reinstall the secuirty update manually and then they can boot their computer. Safe mode will not work. I did boot into single-user mode and run the disk utility there and it says my HD is OK. Since I do not have a firewire or an OS Disk, I am wondering if there is a way to copy those files i need to a USB pen stick then install them onto the computer via single-user mode, considering this is the only way I can boot and manipulate the machine at this time. If this is not possible please let me know so I can find a way to scrounge up a firewire cable or disk. Thank you in advance for any assistance.
Ted K

Thanks to Limnos and BDAqua I know you guys have helped others with these kind of problems from the other posts I read. I just want to list what I did exactly in case anyone wants to try to do this with a usb drive or does not have access to a boot disk or firewire cable.
1: Install security update on a pen drive
2: Boot in single user mode, CMD-S on startup
3: /sbin/mount -uw /
4: mkdir /Volumes/usb (usb can be any name, name of usb drive or anything you want)
5: ls /dev (you need to get the drive listing for the usb drive to mount it appropriately, it should be disk#s# but this is close to what the HD and Cd drives are listed as so you may need to list once before you put the usb stick in and once ater. I had issues inserting the usb drive in single-user mode and it would freeze up the root drive)
6: /sbin/mount_msdos /dev/disk1s1 /Volumes/usb (this mounts the usb drive, i had to use msdos because of how my usb drive was formatted, you may need to check your usb drive format, hfs is the apple format for usb drives but it did not work for me)
7: cp /Volumes/usb/SecUpd2009-001Intel.dmg (this copies the files from the usb drive to the root drivel, at this point you no longer need the usb drive)
8: hdiutil mount /SecUpd2009-001Intel.dmg (this mounts the disk image)
9: cd /Volumes/"Security Update 2009-001" (after i mounted the image this is how it appeared in the Volumes directory, you might need to do ls /Volumes to get the name, the quotes are important to get the whole file directory changed)
10: installer -pkg SecUpd2009-001Intel.pkg -target / (this installs the acutal update, i used the SecUpd2009-001Intel.pkg and it worked though I think you might be able to use "Security Update 2009-001" with quotes as well.)
11: reboot
i hope this helps anyone looking to do this. Thanks again to those who helpes and all the other posts that had information that helped me identify and then fix my issue! I still love my mac.

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Single-User Mode Copying Files/System Does not Boot Past Apple Logo Screen

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