|I know very little about this. I might know *just* enough to|
It looks like your output from the computer is DVI (either DVI-D
(digital only), DVI-A (analog only), or DVI-I (digital and analog)),
you are using a DVI-to-VGA converter/connector, and the cable
has VGA at the computer end but has Y (green), Pb (blue), and
Pr (red) component RCA connectors at the monitor end.
Note that although the RCA connectors are color-coded green,
blue, and red, they do not carry the green, blue, and red signals.
Instead, the green wire carries the luminance (or "luma") and
sync signals, the blue wire carries the blue minus luma signal,
and the red wire carries the red minus luma signal.
Various different systems put the sync signal somewhere other
than on the same wire with the luma signal. I wonder if that could
be the problem here.
I could also wonder if the cable is actually VGA-to-RGB rather
than VGA-to-YPbPr. Decades ago my Apple 2 computer had an
RGB output with a monitor that had an RGB input, but it used a
single connector something like a VGA connector at both ends,
so it had no color coding. My current monitor accepts component
YPbPr RCA plugs like your TV does, but I don't have that cable.
I doubt that will help!
-- Jeff, in Minneapolis