A few days ago I was trying to get my tv to act as a monitor so that I could watch movies on it through my win7 PC. It kept showing up as a black screen with the cursor on it, or weird bits of my desktop, so as I was trying to get it to work I played around with my display settings and set extended display mode on.
Now, if I boot into windows regularly, it is just a black screen, and if I connect the TV and the monitor, the TV is a black screen and the monitor goes into sleep mode (no input). My display works fine in safe mode, and I have tried changing the safe mode resolution (which doesn't carry over) and using regedit to change the x/y resolution values for normal mode, but that did nothing. The most quirky thing is that if I try to boot into VGA mode my monitor also goes into sleep mode. If I use msconfig and choose to boot at base video, my safe mode resolution is appropriately 640x480, but if I try to boot normally, it is the same as if I used VGA mode (no input), I also cannot do a system restore (no save points).
I have an AMD Radeon HD 5670 graphics card and would greatly appreciate any help.