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Anniversary U/D has corrupted startup configuration, no auto repair.
Dell Dimension E520 been running Win 10 for 9 months no problems. Two anniversary failed update attempts and I am stumped. The problem is after boot there is spinning dots with cursor. Ctrl+alt +del gives logon screen but its is empty save for the blue window frame and three icons at bottom right. Have tried: entering password blind but that failed, tried Shift + click restart, it just restarts normally, same again.
I can boot from installation usb drive and get command prompt with Ctrl+F10. to try Fixmbr commands, no affect
Have done 3x power interupt boot to get to repair screen, Auto repair ran check disk, and auto start up repair, all failed to help, but reported start up corrupted. Then tried safe mode. this boots to completely correct logon screen, showing three users: Administrator, Mum, & Dad.
Tried to log on as administrator, accepts logon but after spinning dots, just a black screen, no desk top, tried: win key+p and down arrow, no affect.
Log on as Mum just the same.
Log on as Dad it works starts desk top in safe mode can run Msconfig, Command prompt, etc. looks OK.
The only programs installed other than windows are Office 2013 and Chrome. Nothing else.
Revert to normal boot and its is still hanging.
The only things plugged in are: KB, Mouse, and Dynamode USB WiFi but have removed that and made no difference.
Any help gratefully accepted.