My Macintosh SE / 30 video problem.

Hi! My name is Roberto and I am new to this site. I enjoy playing computer games every so often.

I have a problem with my Macintosh SE / 30. More precisely we see the screen only the part below, that is from the middle down. The other half, the one from the middle upwards, appears completely black. I tried to look all over the web but it seems that this problem is not common.

Thanks for your availability, Roberto