I am running build 7000 (32-bit) on an Intel Core 2 Duo system with an ATI Radeon HD3870 graphics card. In the past week or so, the system has started doing something very annoying. On a resume from standby or hibernate, after waking the monitor up or, rarely, while I am working, the monitor resolution will change from the normal 1680x1050 to 1024x768 and the desktop background will go black (I'm just using the default "Beta" background). If I log out and in again, it will usually reset.A possibly related symptom is that sometimes the monitor will not wake up from going into power save. The system seems to be still running, but no signal is received. Nothing I do with the mouse or keyboard will wake it up and the only fix at that point is a hard restart.I believe that this started when Windows Update installed a new WDDM 1.0 driver. I tried to install the official ATI Catalyst driver for Vista, but it would not install, complaining of lack of device ID in the driver or some such. I've done a lot of searching and haven't found other discussions of this issue. I tried doing a rollback of the driver but I don't think it worked.Any tips or thoughts? Thanks.Steve

If you haven't already, you could try updating the device driver manually through device manager, or try installing the lastest vista driver software (download from ati)in compatibility mode for vista(right click on .exe file, click properties|compatibility|click checkbox and select vista)EDIT: Also try uninstalling and deleting the current driver before installing the driver from ATI.