My MBP won't boot; verbose mode gets stuck at "filesystem is read-only". What do I do?

About a day ago I plugged an SD card into the slot and the OS froze (I'm guessing due to corrupted files). Since then, the computer either takes 10-15 minutes to boot and then freezes on my first app launch, or doesn't boot at all.
I am doing my high school media exams and I need FCP to work right away. This situation is very frustating, can anyone help me? Would Disk Utility First Aid through Target Disk mode help? Should I just use another computer? I have two days to get my stuff done, and I need every minute of my time.
Thanks in advance!
Aron

OK, now the optical drive is just spitting out the OSX install disk and making weird noises. I think it's dead.
Also, the computer doesn't show up as a FW drive when I connect it to another Macbook and boot it into Target Disk mode.
Can someone tell me what's going on with my computer? This is seriously freaking me out.

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alphaflight wrote:
I've got about 300 GB of space, so that shouldn't be the issue.
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Raj wrote:
That is not the reason it didn't work. Here is the actual clarity:
*A retail Leopard DVD should be able to boot a new Macbook Pro unibody.*
So you are saying even if the driver for the controller on which the DVD drive sits is not available in the Leopard DVD you are using because the hardware was not manufactured at the time the Leopard release on the DVD was made, the OS should magically just boot? How is that possible? Unibody MacBook Pros have entirely NEW AHCI chipset - for which there won't be any drivers on the older Leopard DVD and as such the DVD wont be detected once the OS on the DVD loads. In cases where the chipset used is same (as in previous generations of MBP) it will boot.
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On my way home, I stopped at a Mac store and asked them to test this. They successfully booted a new Macbook Pro unibody from an older Leopard DVD. And this is why Apple is replacing my computer, because it is a hardware issue, not a software one.
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My MBP won't boot; verbose mode gets stuck at "filesystem is read-only". What do I do?

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