Thanks everyone for the help! I'm still struggling to get it working. I think I will have to go back and start simple: (1) one DIMM, (2) New PS, (3) maybe new MB (I can't ever access the BIOS any more). Jeff On Mon, Nov 16, 2020 at 9:54 AM José María Terry Jiménez <jtj at tssystems.net> wrote: > El 16/11/20 a las 10:03, hw escribió: > > On Mon, 2020-11-16 at 09:58 +0100, hw wrote: > >> [...] > >> Put a minimal amount of RAM in and go through all of the modules to see > if > >> one or some of them are broken. > > Replace all RAM or test it in another computer. > > > >> Replace the power supply. > > Replace CPU or test it in another mainboard. > > > >> Replace mainboard. > > If the board has a backup BIOS, use that to boot. > > > > > > _______________________________________________ > > Hello > > He said (or i understand) it worked with Ubuntu until tried CentOS. > Maybe something about UEFI? Don't know, but, just to try. > > Best > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos >