I had a very similar problem when I got my 990 last month and it turned out to be the Blue Jeans cable. My TV has both DVI and HDMI inputs. I figured the HDMI would be best but the TV would not recognize the DVI out from the 990. I ordered a new DVI to DVI cable and it works flawlessly. I sent the bad cable back to Blue Jeans and they refunded the $$$.
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Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner
TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv
Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner