I have a Powermac 5500 that I use as an upstairs TV and part-time second computer in the house. I like it a lot (video input card, S-Video out, TV tuner, G3 upgrade, max RAM) but whenever I try to use it with a screen resolution other than 640x480, this unholy, high pitched noise starts. Sounds like it is coming from the very back of the machine, and it sounds like a cricket convention has taken up residence in the back of my 5500. There is usually a slight screen jitter that goes along with it especially at 800x600.
Anybody have any experience with this? Is it the Analog Video board going bad? Or, does it just need an adjustment?