hi
I have a amiga 4000 with a comp scandoubler which is fine when connected upto my 19" crt monitor but when its connected to a 19" lcd monitor it shows lines running down the screen why? Also whats the best way of connecting up speakers?.
Are you running in PAL or NTSC-mode? When in PAL, your scandoubler might output 50hz and this refresh rate is commonly not accepted via the VGA port. NTSC (60hz) should however work fine.
Some LCD might accept 50hz although it is out of the specs and might show the symptoms you describe.
Either get a new scandoubler or get a converter that transcodes the VGA signal to HDMI or Component.