Installed WinXP, can't install OSX
I bought a used iMac with Win XP, via Boot Camp; I wanted a dual-boot system, for weaning an office worker off Win toward Mac. Partitioned HD in two. Win works, but I can't install OSX 10.4.7 from original discs; I get a message saying "Can't install Mac OS on this drive; OS will not boot from this disc." The disc utilities will erase, partition, verify the disc, but it won't accept the OS. I want a Mac more than I want a friggin' Winbox!
I vaguely remember a procedure to boot from another computer using firewire, but vaguely-remembered is not good enough to make it happen.
You're talking about "Target Mode". Two Mac connected via a firewire cable. The target Mac is booted while holding down the "T" key and its hard drive icon shows up on the other desktop. As to your system not installing, I suspect that the gray install disk you got is not for this machine. Apple will sell you the orginal installation disk for $15. Just call them and give them your serial number and a credit card number.