I'm trying to install X5 on a machine that won't accept the newer,
larger, DVDs.

I'm assuming by "X5" you mean Leopard 10.5, the first OS to ship on dual-layer discs.

Yupp

if you happen to have a home burned copy on a dual-layer DVD-R or DVD +R disc, this could possibly not work, and often firmware updates for the DVD drive can add support for more media types and enable an unreadable disc to work, BUT you probably need a Windows PC in order to update the firmware.

Probably what is happening here. Oddly enough some burned DVDs are accepted and some are not.

I have moved a X.5 .dmg to the computer's hd and now I'm
trying to reboot the whole machine from the dmg. Is that even possible? I've been told so.

No, you can't boot from the .dmg file. You must clone the .dmg onto a partition and then boot that partition.

Can it be done from an external HD?

Anders

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