My system: home built AMD quad core system running Windows 7 32bit, using an ATI HD4800 video card. Connected to an Onkyo TX-SR607 AV receiver via HDMI, then into a Philips 42" HDTV. Setup had been running fine, with the exception of a thin (1") black bar on either side, where the screen wasn't extending to the edge. Had been running the refresh at 59 Hz because 60 Hz caused the screen to extend beyond the edges of the TV screen.
Got bored (always a bad thing) and tried playing with the settings to remove the black bars. When I set the refresh to 30 Hz, which was one of the choices, the screen went black. The Onkyo began searching for a signal, with the HDMI symbol flashing, then briefly stopping, with the PCM & DSP symbols showing, then back to flashing. Repeat. Sound through HDMI is working because I can hear the Windows "bonk" sound as it seems to be finding, then losing, new hardware. Couldn't get any video to come up on the screen and the graphics setting apparently didn't revert back to the last setting after the countdown clock ended.
Hooked up an old 19" LCD monitor I had to the VGA port to see if I could change the refresh to the Onkyo back. When I did, not only did the monitor work, but the TV came back on. Shows both monitors in the "screen resolution" window, with the TV display listed as "TX-SR607". Corrected the refresh, unhooked the old monitor, then rebooted. TV went black again as Windows began to load. Onkyo does the search thing again. Connect the old monitor and both come on again. Confirmed settings were same in ATI Catalyst control center. Even tried uninstalling, then reinstalling ATI drivers. Without the ATI drivers, TV comes on without monitor attached, but as soon as drivers install, back to black. Tried plugging HDMI alone into an Infocus projector, which worked fine.
Seems to be an issue between the ATI card/drivers and the Onkyo receiver. Any ideas how to correct? Had a similar issue a long time back, when I first build this system, but for the life of me, I can't remember what I did to wean it off the extra monitor.
