I was thinking of building a HTPC because I really want a 1:1 pixel mapping with my HS20. Id only use the PC for DVD playback and nothing else, so thats the only important factor. Ive tried playing DVDs on a number of PCs and every time Ive been unimpressed. I gave it a go with my current PC and for the most part the image is very good. However, when there are fast changes in the picture I got a horizontal line effect for a fraction of a second, which it is very noticeable and distracting. I tried to take a screenshot but they didnt show up on the screen captures so I got a pause and took a picture of the screen. Take a look here and here. I get a completely different sort of problem on my laptop. Neither problem occurs with my Philips 963sa DVD player, which rather puts me off the HTPC idea. Im using an Athlon 2500+ Barton, and a GeForce FX 5600 Ultra with WinDVD software. So whats the problem? Processor not fast enough? Bad software? Crap graphics card (definitely, but is it crap for DVD playback as well as games)? If it is my hardware or software, what would I need to get decent DVD playback? Reading around the forum I get the impression that ATI cards are better for DVD playback than nvida. Is that correct? Id be really grateful for any advice as to what I need to get DVD playback without these sorts of problems.