[CentOS] CentOS-7 problem

I installed CentOS-7 on an HP MicroServer
from a KDELiveCD (on a USB stick),
and it ran OK for a couple of days;
but yesterday it wouldn't reboot -
the dots went round the circle indefinitely,
and when I clicked on Ctrl-Alt-Delete it said 
  "[OK] Reached target Initrd Default Target".
There didn't seem to be any way to reboot
except to press the power button.

I tried running the rescue kernel,
but that didn't help.

I tried installing the netinstall iso on a USB stick,
and choosing the repair option -
this ran ok, and I was able to run grub2-install,
but this failed to boot as before.

I'm wondering if there is anything else I could do
to resuscitate the system?

Fortunately, I kept the old 6.5 system in another partition,
which I am using now.



-- 
Timothy Murphy  
e-mail: gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin 2, Ireland