Ok ill start by listing my system specs:

Intel core i5 3.2ghz
4gb RAM
Windows 7
ATI radeon HD 5500 series
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TV- LOGIK LCD TV ***LINK*** http://www.google.co.uk/products/catalog?hl=en&rlz=1C1DSGL_enGB428GB428&q=logik+hd+ready+lcd+19inch&bav=on.2,or.r_gc.r_pw.&um=1&ie=UTF-8&tbm=shop&cid=16922295863805658213&sa=X&ei=toDXTcibDISGhQfuzLnPBg&ved=0CD8Q8gIwAw#
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Ok so when i connect my tv to my pc through a hdmi to hdmi not dvi ADAPTER or ANYTHING, i get an awful quality but i get sound perfectly, so i tried all the available resolutions but still no luck, i CAN read and see the screen but it just looks well not hd, hard to explain, im afraid changing res is as far as my skills go.
So any help would be greatly aprreciated
thanks
tom
The link says:
Quote

[£120 new from 2 sellers
The Logik L19DIGB10 19" HD Ready LCD TV is a great-value television with a High Definition screen. This LCD television offers a useful array of features at a remarkably low price! For example, in addition to the digital Freeview tuner for watching your favourite TV programmes, the Logik L19DIGB10 includes a USB port for adding USB storage to record and playback programmes at your convenience. CONNECTIVITY options are also surprisingly generous in the Logik L19DIGB10 19" HD Ready LCD TV . An HDMI connector supports high-quality pictures from a Blu-ray player or modern game console, while component, COMPOSITE, and SCART connectors support older devices. Affordable need not mean cheap, as the Logik L19DIGB10 19" HD Ready LCD TV proves! | Electronics > TV > LCD TVs
/quote]
Basically it is a HD ready TV. The HDMI connector is for the output of a Blu-rat player.
The manual for the card you have should explain what options you have to pick.
http://www.filetypepdf.net/234/ati-radeon%E2%84%A2-hd-5500-manual/
The manual specifies what adapters and connectors you can use, but there does not seem to be specific info about how to adjust the quality. This may have to do with which driver you have installed. Have you adjusted resolution for the external monitor using the utilities provided in Windows 7 for display options?