Is the monitor mounted horizontally? If so, then you have no horizontal deflection, which you rarely ever see on the screen. typically if you lose your horizontal, then you get nothing on the screen. Check your yoke connector (and your yoke), and make sure the horizontal width coil isn't damaged. make sure the remote board is plugged in properly.
If the monitor is mounted vertically, then check your remote cables, and check your vertical output transistors...