My identify window no longer appears when I identify a feature in ArcMap.
You may have a registry issue. Start regedit. Navigate to HKey_Current_User\Software\ESRI\ArcMap\IdentifyResultsDialog\IdentifyWindowsPos. Modify the IdentifyWindowPos key to a value such as 20,20,400,400. More information may be found in Article ID: 21485 The Identify Results window does not display.
I have no idea how easy or difficult it may be to find that article