well I have a horizontal line that starts at the top of the screen and slowly falls to the bottom of the screen and then it repeats... it is only there if I have the analog cable connected to the Home Theater PC

I have 2 analog tuners that share a split cable line... when I disconnect one of the cables the falling line is less noticeable, when I disconnect both of the line you cant see the falling line at all

here is what I am running

15" standard LCD projector

KWORLD TV1680R VGA Interface Video $85 (this controls switching between HTPC and component video aswell and up/down scalling to the projectors native resolution)
http://www.newegg.com/product/product.asp?...N82E16815100147

receiver: Denon AVR-3300 (handles all audio switching and most component switching before it reaches the KWORLD switcher)
http://usa.denon.com/ArchivedAVRecei...Model=AVR-3300
Reviewed here http://www.audio-ideas.com/backiss/w..._avr_3300.html

Mains: JBL S312II as reviewed here http://www.audioreview.com/cat/speak...5_1594crx.aspx

SUB: JBL S120PII 400 watt(RMS) powered subwoofer as reviewed here http://www.audioreview.com/cat/speak...3_2741crx.aspx

rear: Mission 6.5 inch 2 way rear speakers

center: Custom JBL (L-series) / Pearless 4-driver center channel with custom crossover

HTPC:

Cpu: Intel q8200 Quad Core @ 3.0GHz

Motherboard: ABIT IP35 Pro

RAM: No Name DDR2 800

PSU: Coolermaster 650Watt

Graphics Card: 8800GT 512MB with Zalman cooler

Hard Drives: 2 Western Digital sata 2TB hard drives, total 8TB storage space

Video Tuner: ATI pvr-550, Happauge 1600 dual tuner

Optical: 2x Blu Ray

Silver Stone HTPC case http://www.newegg.com/Product/Produc...82E16811163033

I am using Windows XP Porfessional and Beyond TV 4

Sounds like interference. Time to start looking for a netter way to route your cables, I think.

already covered that idea... its really weird... also if that where the case my digital antenna would do this too as they run side by side...

Digital gets better noise rejection. It's easier to tell if a signal should be a 0 or a 1 than if it should be 0.467772 or 0.467536