Start a Linux instance and attach to it a 5 GB empty volume
Second, scp a known good Linux RAW image into this instance

scp [email protected]:/data/Centos_good_image_raw.img .

Make sure the attached volume is visible in the instance:
fdisk -l

Copy the Centos image over the attached volume:
dd if=./Centos_good_image_raw.img of=/dev/vdc

Detach the volume and boot from it using Dashboard. Choose any image when booting up, but specify "boot from volume" and point to the volume containing the image.