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Option Explicit

Private Const WM_SYSCOMMAND As Long = &H112
Private Const SC_MONITORPOWER As Long = &HF170&
Private Const HWND_BROADCAST = &HFFFF&

Private Declare Function SendMessage Lib "user32.dll" Alias "SendMessageA" ( _
     ByVal hWnd As Long, _
     ByVal wMsg As Long, _
     ByVal wParam As Long, _
     ByRef lParam As Any) As Long

Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" ( _
    ByVal hWnd As Long, _
    ByVal wMsg As Long, _
    ByVal wParam As Long, _
    ByVal lParam As Long) As Long

Private Sub Form_Load()
    PostMessage HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, ByVal &
End Sub