Qubes OS Booting Issue

Hello, my laptop (Lenovo X230) has stopped loading after entering the disk encryption password. All that I see is an underscore blinking at the top right corner of the screen (see attached image).

I was backing up the system before this issue happened (on the dom0 desktop), saw an error that a particular pool is running out of space, didn’t think much of it, deleted the backup and turned the laptop off. Now all I see this this underscore…

Could someone please help? I’ve spent a huge amount of time setting this system up, would be a shame to lose everything.