Windows 8 doesn't load past welcome screen

Everything works until and up to "welcome screen" which disappears after a few seconds to a blank screen. Used 'shift' and F8 to get to repair screen and then to Advanced options I know very little about this computer as it is very new. Tried to return to last known working date. It says it does so but still just a blank screen What to do next? Thank you for any help Berenice.

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