I have a dv7 Notebook with the ATI Radeon HD 4250 graphics processor. Lately when I power up the computer (with power from the power supply), the display goes dark (totally shut off) after login and won't come back on again. I assume the display goes dark when the system tries to start up the 4250.
If I power up under battery power, the display works fine, presumably because the 4250 isn't being started up as a power saving measure. After fully bootin up under battery power, I can plug in the power supply and switch to the 4250 with no problems.
Is there something I can do to "reset" the 4250 so that it boots up properly?
BTW, I am on Windows 7 and the 4250's driver is up to date.