Gordon Messmer wrote: > On 07/03/2015 03:43 AM, Timothy Murphy wrote: >> I've tried this again, and it does not seem to work. >> Have you actually tried it? > I don't have a CentOS system here that I can reboot readily. And it > occurs to me that if I did, I didn't ask if your system boots via BIOS > or UEFI. Thanks for your response. It boots via BIOS, and in fact boots into CentOS-7/KDE on a USB stick (that is how I installed CentOS-7), and into Fedora-21/KDE on a stick. But it doesn't boot back into the CentOS-7 system that is normally running if I say "sudo grub2-install /dev/sdc" (the USB stick is sdc). It just comes up with the repeated "-", which I take to mean it has found the boot-loader on the USB stick, but has not found the kernel on /dev/sda6. -- Timothy Murphy gayleard /at/ eircom.net School of Mathematics, Trinity College, Dublin