Got white screen with big Mac HD icon in center with arrow below.

turned computer on this morning got this screen as described above.....
then a few seconds later I got the regular desk top and have had no problems.
Ideas as to why it started up with that mac HD icon?   Never seen that before...      No start up problems in the past.

Go to the flag up on the right side of your Menu Bar and select Show Keyboard Viewer.
Then start testing some keys including the Option key and watch the Keyboard Viewer to see if any are stuck or sticking.

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    ===========
    Your profile is a complete blank!!!!
    When posting in Apple Communties/Forums/Message Boards.......It would help us to know which Mac model you have, which OS & version you're using, how much RAM, etc. You can have this info displayed on the bottom of every post by completing your system profile and filling in the information asked for.
    CLICKY CLICK-----> Help us to help you on these forums
    ***This will help in providing you with the proper and/or correct solutions.***

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