I have recapped a Macintosh Portable for someone, but when I try to boot it, the screen looks as follows:

What might be malfunctioning? The computer had rust damage on the inside and I ultrasonically cleaned the board, but it still does this. Any idea of what components I should look at on the board?
I've attached some photos of the top side of the board if anyone can see anything I might have missed:



What might be malfunctioning? The computer had rust damage on the inside and I ultrasonically cleaned the board, but it still does this. Any idea of what components I should look at on the board?
I've attached some photos of the top side of the board if anyone can see anything I might have missed:



