Built a new pc friday, been fine.

Left it on, came b back from the shops 30 mins later, and now all I've got is a black screen with a flashing cursor in the top left hand corner of the screen an inch down.


Power off / on , it starts up, bios etc, then when you get to the bit where windows should start to load, you get the black screen and cursor?

Stuck to using my phone now, so not great for googling help!