Since currently there is no access to the system, I'm not going to speculate about RAID with those 2 drives.
jgpa wrote:The machine is c. 2006
Regarding the BIOS version, there is a high probability that a newer version (than the one from year 2006) is available. Since there is currently no access to the system...
jgpa wrote:It was the i486 from the download page, about a week ago
Since the current Gparted Live latest version was promoted to “stable” less than a week ago, we now know that you are not really using the very latest. I'm not sure it would make a difference in this particular case, but knowing the exact Gparted Live version and the complete exact ISOLINUX message you received are still relevant.
BTW, there is a file named “Gparted-Live-Version” in the root of the Gparted Live media. Opening it with any simple text editor should tell you the exact version you are using (unless you customized it).
If you happen to get the same (or similar) boot issue again, it would be useful if you could provide the exact complete info so to narrow down the problem.
Regards,
Ady.