Cant enable ATI display driver

ATI 5870

Ran fine for a year. Something happened and now if ATI driver is enabled get black screen as soon as Windows 7 (and 8) gets past splash screen.

Runs fine in generic VGA mode. BIOS diagnostic for video card (Dell XPS9100) checks out video without any perceived problems. Can't find ATI specific diagnostic.

Puzzled. Is my video card shot.
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More about cant enable display driver
  1. Are the drivers updated?
  2. Yup, they're the latest.

    I think what I need is a diagnostic that runs independant of the driver.
  3. Yes it's the latest from ATI, besides it ran for over a year and then stopped so it's not the version, although I reinstalled jsut in case it was corrupted.

    But since my last post I decided a new card was required (different ATI vendor) and unfortunately it does essentially the same thing. So the problem isn't the video card itself, but something indirect - perhaps the power supply or the PCI bus. It's something that's changes after the Windows splash screen.
  4. This is a Dell XPS9100 that was shipped new with the card (18 months ago). The PSU is a 475W unit.
  5. Had already tried fresh install of Win7. That's how I noticed what the issue was. Ran fine until the first automatic upgrade which installed the ATI driver. Uninstalled just it, alls was well (as well as can be expected anyhow without a video driver).

    Also just tried a new power supply - same thing. That pretty well just leaves the motherboard if it's a HW issue. Obviously it could still be software but I have no idea how.
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