You are using a modem to connect to a network or to the Internet from a Windows Vista-based computer. If you put the computer to sleep while the modem connection is active, the screen goes black. After several minutes, you may receive a Stop error message that resembles the following:

STOP 0×0000009F (parameter1, parameter2, parameter3, parameter4)
DRIVER_POWER_STATE_FAILURE

The Stop error may occur anywhere from five to twenty minutes after you put the computer to sleep.

When this problem occurs, you may be using a traditional modem, an ADSL modem, or a cellular phone to connect to a network or to the Internet.