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Sometimes it seems like if you jiggle the mouse prior to unlocking that you have less of a chance of getting a black screen. We had one guy who got a new Win7 machine about a month ago and did not get a single black screen until just yesterday. Sometimes the problem goes away after one of the "solutions" or sometimes it happens on its own. Curiously, sometimes someone might go days without a black screen even though they lock their computer several times a day, then suddenly the problem will crop up again and they'll get a black screen as often as 1 out of every 2 times. We've tried several "solutions" such as changing power settings, changing virtual memory settings, re-installing video drivers, changing users/groups configurations, clearing out all event logs, disabling event logging, changing UAC settings, and changing monitor settings (we all have dual-monitors). We've been having this issue on several machines for several months now.
ACER LCD MONITOR X223W SHIFTED SCREEN DRIVER
My video adapter is an ATI, and I have experienced this issue with both the bundled driver that comes with Win 7, and the Win 7-specific driver from their Web site. I have had this with the beta, RC, and now general release of Win 7 Vista didn't have this issue. I am able to RDP to the machine from my MacBook, but when logging in as a different local administrator, Win 7 waits a rather long time for my active session to respond to a dialog (which I can't see) before taking over the active session and locking the console. This happens intermittently, and does not seem to be related to which applications I am running when I lock the system (I originally suspected VMware Workstation to be the culprit, but it happened after a rebuild, before I installed VMware Workstation). I can't check my video adapter model, as my machine is currently hung in the Black Screen abyss. I am using a Dell OptiPlex 755, Intel Core 2 Duo, Windows 7 Enterprise 64-bit.