Acpi pnp0401 4
Fast fix for HP 8540p in XP? =) (Page 1) - DriverPack Mass Storage - DriverPacks.net Forum - The support forum for the DriverPacks. Several end-users try and log into their Windows 7 machine, they get a message, failed to connect to the windows notification service and it goes to a black screen. I had this Windows could not connect to the system event notification service problem and forced the computer to turn off. I then restarted it and logged in as Admin.