no video when connecting to an amp

Hi, I have just reinstalled win7 on my pc after all the updates and driver installation,(took hours) I have discovered I can only use my amp if i disconnect my TV input, switch the amp input on(via its remote) and switch to the amp via (tv remote) all this whilst the PC is rebooting.
Before the reinstall i could have both switched on and choose which output to watch or have both on and choose which audio to listen too. I have uninstalled, reinstalled and tried old new and some really weird drivers, cleaned the system with various cleaners and sweepers but nothing works, I thought that maybe my card was failing due to power problems but it works fine when i connect to another monitor, at the i am using the reboot so i can watch hidef stuff but its a pain

Anyone any ideas. Cheers


Raz

That is too weird. What version of the ati drivers were you using before the reinstall? Are they the same as now?

@sub styler; trouble is if i switch the amp whilst using the tv as a display all i get is a black screen, i then have to reboot to get desktop back.

@Cubicsilver: 11.11 before, tried some even older drivers and waited or update but no go thing is i was using 11.11 for BF3 before with no problems.

cheers

Raz

I use a similar setup. One time my picture went all wonky after I connected a different computer to my amp and when I connected the original computer, it woudn't return to normal. I tried all sorts of things. Eventually I ended up unplugging my hdmi cables and unplugging the power to the amp and tv for a couple of hours. When I plugged it back in, it worked again. The second time it happened I went into the amp's menu (LG) and did a reset. It worked.

Maybe worth a try?

yeah, will give that a go.
after much thought the one thing i did different on this install is have the graphics card connected to both sources instead of just 1, don't think it should have made a difference but you never know so if your suggestion doesn't work i may go for a reinstall as it has very little on at the moment
Nice spot on the other post

Raz

Just as an update, After trying various methods to fix the problem I eventually reinstalled win7, but only had 1 video output connected, since then all is good in the land of HiDef