Up grade from broken Kalyway10.5.4 to iPC10.5.6 possible?

[slapguts]

Afternoon-

 

I had (until recently) a perfectly working install of Kalyway 10.5.4 on a Sony Vaio laptop (Intel 1.6 Duo, GMA950, 2gigs RAM, AC97 audio). Both cores were working, QE/QC working, sound, network viewed as Airport card, it even slowly blinked the LED while it was asleep.

 

While I was on vacation, my GF updated iTunes, and the entire OS to 10.5.6. Kernal panics. Spilled coffee on my backup drive, too. {censored}.

 

So I decided to see if there was something a little more recent than starting at 10.5.2 again, and I found the iPC release. Downloaded the .iso, burned to a DVD slowly, and got 100% verification.

 

Only problem is, my computer won't boot from it. Tried the internal optical drive, and an external. Both are recognized by BIOS. If I remove the internal hard drive from the BIOS boot list, I get a 'No operating system found' error. Otherwise, I get the standard Darwin prompts to boot to the broken previous install. No 'Boot from DVD' option ever appears.

 

Is there something I should be doing to this .iso before burning it to DVD? Can it not be burnt on a Windows machine (all I have available)?

 

I no longer have the Kalyway disc, gave it away to a friend due to my over-confidence. Currently downloading iDened 1.4, but would rather not wait 14 hrs.

 

HUGe thanks in advance. I have a feeling there is some simple little step I'm missing...