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If the screen is going completely black (no bouncing Pharos logon block), you may want to look at the power management settings on the workstations. Assuming though that the "please login" box is bouncing around then we know that we are talking about the built-in Pharos screensaver which can be disabled on a per SignUp client/workstation basis with the following registry key:
NAME TYPE MEANING DEFAULT
Allows administrators to switch off the SignUp Client screen saver, to cater for excessively slow machines. A value of 1 means the screen saver is on, 0 means it is off.
32-bit Windows Version = HKEY_LOCAL_MACHINE\SOFTWARE\Pharos\SignUp Client
64-bit Windows Version = HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Pharos\SignUp Client