I should point out that in my shoddiness I did get alerted as to the fact the server was down earlier on today, but being busy at work I forgot until later
I think the sudden outage the other day may have introduced some corruption to the virtual disk. I mounted a live CD and fsckd the disk while unmounted and couldn't find anything wrong with it (despite the server thinking something was astray hence not booting earlier). I can only hope that the disk is fixed now.