Cannot sleep or shut down when connected to TV through DVI

I recently reinvigorated my 2003 Power Mac G5 (Power PC) with a clean install of OSX Leopard and connected it to my TV via a VGA cable and DVI adapter.  I soon discovered the computer would not sleep or shut down with the TV connected:
- Selecting "sleep" from apple menu, OR
- Pressing sleep button on original ADC monitor (with both monitors connected,) OR
- Waiting for 15 minute automatic sleep mode:
     computer sleeps (tower clicks off as normal) but immediately wakes again
- Selecting "shut down" from apple menu:
     computer shuts down completely but immediately reboots
When the G5 runs on only the original monitor, sleep and shutdown commands work as expected.
Aside from unplugging the DVI adapter every time I want to sleep or shut down, is there a solution to this problem?

I've seen the TV problem before, not sure there is a cure, but perhaps one of these...
http://www.pccables.com/cgi-bin/orders6.cgi?action=Showitem&id=ID15122041&partno =30011&search=VGA_SWITCH&rsite=&rcode=
The DVI ones don't have high enough resolution...
http://www.pccables.com/cgi-bin/orders6.cgi?action=Showitem&id=ID15122044&partno =81112&search=DVI_SWITCH&rsite=google.comsearc&rcode=

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