Hi mark ...sound like a resolution or refresh rate monitor problem.
Normally catalyst start resolution at 1024 x 768 at 75 hertz this frequence
not is good for old monitors. put this monitor like secondary (you can set different refresh time after start catalyst) and put on primary monitor new one.
bye.

ROBERTO NOVELLI Resp. Tech. Dept.
Ianiro Aldo srl Company
roberto_novelli@ianiro.com
ianiro_lab@ianiro.com
www.ianiro.com
tel.+39.06.93.10.198
fax+39.06.93.162.162

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