4870 No Signal To Monitor

May 8, 2009

I am experiencing a very disturbing issue with my newly installed ATI 4870 and my Windows 7 RC (7100). Prior to installing this card I had the following setup, which worked flawlessly.

nvidia 8800gt

intel p35 chipset in the motherboard

Samsung a656 40" LCD connected via a DVI to vga connector.

When I got my 4870, I uninstalled the nvidia drivers,rebooted, installed the latest (9.5) ati drivers and rebooted.

Then, I got a no signal in the monitor at the windows login screen.

Mind you, that when I (dual) boot in Vista, using the 9.4 drivers, everything is fine.

Things that I tried:

1. Creating a new monitor.inf file (located at the windows folder) using info from a post in this forum.- This should not make a difference, since I was using the same monitor.inf file in the same windows 7 installation, whitout any issues before I installed the 4870.
2. Changing the ATI .inf file to include only one resolution for the r7x cards 19 20 10 80 00 00 00 60- I think it sould be a refresh rate issue, since the vga port of the TV supports many resolutions, including 1600x1200 etc.

- It could also be an unsupported resolution, if the ATi driver cannot detect the monitor correctly.
3. Installing the windows 7 default ATI driver.

Things that I noticed:

1. I can login only in safe mode.

2. Low res mode (640x480) gets me to the login in screen, but as soon as I input my passowrd, I get no signal.

3. Changing DVI ports in the 4870 (it has 2)

Does anyone have any ideas?

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