Specifications

Hot Issues Jittery or Blurry Video with Power Macintosh 5500/6500 - 4
Power Macintosh 6500 computers should not be set to
resolutions higher than 1152x870.
Check the Monitors & Sound control panel to make sure the
resolution is set to 1152x870 or lower. For a chart of
supported monitor resolutions for the Power Macintosh
6500, see the Specifications chapter in the Performa/
Power Macintosh 6400 and 6500 Series manual on Service
Source.
Although these symptoms have never been reported for a
Power Macintosh 5500, the 225 MHz logic board used in the
Power Macintosh 6500 is also used in the 5500. Refer to
the Troubleshooting chapter in Service Source for both
Power Macintosh manuals.