On my Dell Studio XPS laptop, running W7 (64 bit), I receive the following error message every time I unplug the power cord from my laptop: "Ext_framebuffer_object extension was not found." When I plug the power cord back in, I receive this error message: "The AC power adapter type cannot be determined.....". I then have to shut down, disconnect my battery for a few minutes, reinstall it, and restart to get the laptop to recognize the power adapter. Is it a bad battery or power adapter or something else? Thanks for any help.