Mark - Saw your note on classiccmp.org re the Dynalogic Hyperion. I have several of these machines as well as some diagrams and parts lists for them. Two of them have a problem in their video circuits such that their screens show nothing nor is there a signal out of the external monitor RCA plug, yet the computer will otherwise continue to function normally. I have been looking for some guidance on how to track the fault down and fix it but have so far had no success. Any thoughts? Regards Leo Butzel <mailto:lbutzel@attbi.com>lbutzel@attbi.com Seattle, WA