Nvidia HDMI settings.

hello guys I'm struggling with a real annoying problem I really hope you could help because I suspect the solution is a real easy one.

setup is Compaq CQ61, nvidia G 103M connected via HDMI to a LCD screen, support up to 760p.

The computer was working great with the LCD, I could play games and watch movies. It always showed the [760p] on the LCD screen while I was connecting the computer, and it was negotiating for a few seconds before getting the picture.

Now I've changed the resolution settings, I don't remember what I did, the LCD screen says 'Not Supported' on one side, and [m485 on m485 75mhz] or something similar on the other side. There's no picture, occationaly there's image noise. The laptop gets completly slowed down since the HDMI was connected, the memory seems to be maxed out because the mouse cursor disappeared (can still control), if I disconnect the HDMI cable then the computer hangs and I have to brute shutdown it.

I go to display settings to try to get to normal resulotion again, but whatever I do, the computer either crashes and I have to brute shutdown it without saving the settings, or nothing changes. I've tried changing resolution to 1280x768, 800x600, 1366x768. Its still on 60mhz.
I've tried to reset to factory defaults from the nvidia control panel.
I've tried system restore to go a day backwards.

Nothing changed the HDMI settings .. and I still can't go back to 760p... I don't know what to do anymore other then rollback to Laptop Factory settings with nothing but operating system... Please help me guys I'll be most grateful.