Can I reboot from an upgrade disc?

I'm currently running Leopard on a Macbook Pro and kernel panics have prevented me from using my computer for the past couple days. After I turn it on, I get the Apple logo and it seems to start loading but I just end up getting the "You must restart your computer by pressing the power button" message. Restarting just results in the same problem.
I tried to reboot from the Installation disc to use Disk Utility but I discovered that there's something wrong with my disc as the computer spits it back out. There are no visible scratches/smudges and it worked fine about a month ago, but it's not working now.
So my question is: if I buy the upgrade to Snow Leopard, will I be able to reboot from that disc, or am I going to have to take the whole thing in to get it serviced?
Thanks for any help you can provide!

Installing a different operating system will not solve your burning problems.
If the machine is under warranty, have a service center clean the drive.
If the machine is out of warranty, get an external drive from http://www.macsales.com/ that has DVD booting support, and attempt to boot off that.
If it won't boot off the external drive, then you need to replace the disc, if it is supported by that Mac.
If replacing the disc doesn't solve the problem, then you may have a hardware issue with the machine.

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