Chas,
Try running it at its naitive resolution as your computer monitor.
I got a Sceptre 37" Lcd with 1920*1024 res (1080p)... and first
hooked it up to the pc at lower resolutions cause my ancient card wouldnt
pump out the full res.
It looked 'ok'. But colors were off, and things were a bit blurry. I was
pretty dissapointed.
Then I read the reports, and followed them. Used a new vid card,
a DVI to HDMI cable (provided), and upped the res to the full
capability....
WOW! What a difference. It was like night and day. Now
all the colors are perfect. The text is crisp and clean. It
looks just about as good as my 17" pc monitor in terms of
clarity and color... which blew me away.
DVDs look a bit bad using the pc player.. cause they are
not enough definition for this tv. Need Hi-Def players,
or an upconvert player. Someday Ill get one.. but
most are still at 1080i and not 1080p...
The pic seemed fine for fast motion on dvd.
Tho on the highest res, you can see a small amount of blur
when moving something very quickly on desktop. Ive not done
enough gameing lately to test it out fully. I really
bought it for doing graphical and possibly 3d work.
Ohh, and cause Im tired of moving and flipping things
arround on a small monitor.

Best purchase ever!

Anyway, I suspect a simular case with your tv. Also, if theres a connection
for DVI and Svga.. make sure to use the DVI instead. Svga strangly doesnt
match the signal clarity of the DVI cable. The details and colors will
suffer on the Svga cable.
Using res lower than its naitive, means the pic will be downconverted...
and thus again be 'off'. A slight blur, and maybe even colors off too.
Depends on the internal converter I guess. This converter doesnt seem
very good.. but naitive res is great.
http://www.costco.com/Browse/Product.aspx?Prodid=11042448&whse=BC&topnav=&browse=&s=1