Install disc not recognized

I just put a new hard drive in my MBP 15", and need/want to install Leopard. My Leopard dvd is an upgrade disc, so I have first to install Tiger. However, when I insert my Tiger dvd, I get a flashing dark folder icon with a question mark. Presumably, the start-up info isn't found my Tiger dvd. Any ideas why? I get the same result when I try to start up from a Jaguar cd too. Pete

Pete N wrote:
I should add that the Tiger install disc does work on my wife's laptop--at least to the extent that I can start up from the disc, something that I can't do on my computer. I guess it's time to dive back into my computer and make sure that I didn't leave something disconnected...
After installing the new drive, did you reset the PRAM and NVRAM?
It's a remote possibility since you can't boot from the CDs, but worth a try.
It's also possible that your optical drive is either bad, or as you suggest, may have a cable improperly attached.
An improperly attached cable could also prevent the system from booting normally.
When it boots, do you hear the normal chimes, indicating the system passsed the POST? If not, the chime count will tell you what might be wrong.
Another test would be to see if you can boot into an external drive.

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