Disconnecting Second Monitor Changes Resolution of Primary

[theFaust]

Hey guys, here's a quick overview of my problem:

I'm setting up an older box to work as an HTPC. While updating it and installing new drivers, the PC has been connected to both my TV and a secondary monitor. The second monitor has been necessary for finding the proper resolution for the TV (1776x1000) because other resolutions cause the TV to display an input error message over a black screen.

However, removing the second monitor now causes the PC to switch the TV's resolution and render the TV unusable since it cannot be used to switch resolutions. Removing the second monitor's connection while the PC is running and while it is shutdown lead to the same result. In addition, disabling the second monitor via the Screen Resolution window incapacitates the TV until the settings are reset.

Specs:

PC:
Windows 7 64-bit
AMD Athlon 3800+ 2.41GHz
Radeon X1900
Catalyst Control Suite v10.2 (the latest this GPU will take)
ASUS M2N-E motherboard

TV:
Mitsubishi WD-62327
Receiving output via DVI-D to Monlink (DVI) input

2nd Monitor:
Acer X193w+
Receivingt output via DVI-to-VGA input

Troubleshooting:

As stated above, disconnecting the monitor while the PC is powered on or powered off has no difference.
Disabling the monitor via the Screen Resolution window has the same effect.
Swapping output ports on the X1900 has no effect.
The second monitor's resolution does not change if the TV's output is disconnected.

Any input is greatly appreciated, thanks!

 

[photonboy]

1) One of the monitors should be the MAIN one and the other an EXTENDED. Make sure they are not cloned.

2) Page 19 of your TV manual says not to use a PC input.

Having said that, if I understand correctly it supports the HDTV standard of 480p or 1080i.

Thus, the ONLY setting you should be using likely from your PC is THIS one: 1080i_NTSC@60Hz.

That MUST be done in the HDTV section of the Catalyst Control Center (get the latest drivers). You will additionally likely have to correct the Overscan in the CCC as well.