Tried from the desktop short cut and from programs. When I click on the icon and starts for a split second then nothing.
Can you please write what is your LibreOffice version and what is your operating system name/version?
Try to rename your LibreOffice profile (and when LibreOffice starts up it will create a new one), maybe profile got corrupted somehow: https://wiki.documentfoundation.org/UserProfile
Try to rename your LibreOffice profile (and when LibreOffice starts up it will create a new one), maybe profile got corrupted somehow. See details on how to rename a profile: https://wiki.documentfoundation.org/UserProfile