zlyj@vax5.cit.cornell.edu ( ) (06/21/91)
I recently put in a 105 Rodime drive in my SE/30. Shortly thereafter the video began to get funky. Horizontal waviness about 1" from the top and from the bottom of the screen. Occasional extreme jitteriness. Not really correlated to disk activity. Well I fixed it. I wasn't patient enough to vary only one variable at a time, but here's how I did it: Took apart the mac. The drive bay itself had grown a little loose. Removed the motherboard so I could get to the screws. Tightened them down. Loosened the retaining screw that holds the HD piggback to the FD. Slid the HD toward the back of the computer. Tightened the retaining screw. The cable was all over the place. Bunched it up real well, sort of scrunched it toward the back of the computer. Voila. Rock solid video. Well almost. Still have to keep the cookie sheet between the Mac and my VGA monitor when both are on. Good luck.