I have been having significant boot-up problems since the recent W10 creators (fall) update, with an average boot time of 1.5-2 hours for last couple of weeks (no issue from sleep and computer runs normally once up). In that time there is only a black screen (no cursor, looks to be off, but power/WLAN lights on) but after a while normal login screen appeared. Ran virus scan (clear), cleared startup programs/services/fast startup, updated drivers (I can't access BIOS, but they look up to date), tried repairing Windows and the update (wu fix) (both failed), but problem persists. Decided to roll back to previous version of Windows in recovery options (as no boot issues before the update)... Machine was on black screen (but doing something with low fan noise occasionally) for over 48 hours!
Looked like it was probably in an 'infinite loop' (difficult to know as I couldn't see anything - tried connecting to external monitor but no output), so finally powered off. I have tried rebooting using all F-key combos, 0 and esc, but still nothing... just a black screen. Any ideas on other ways to access BIOS/UEFI or bootup menus?
Toshiba laptop s50-b-15q
AMD r7 m260 Graphics card
Edited by tempcheck, 24 September 2017 - 02:04 PM.