My brother brought me a Dell with a too similar issue. The OS was "blown" but we were lucky that he was running W10. Using the stick made with Microsoft's Media Creation Kit I reinstalled the W10 OS and it's fine now.
My Dell Inspiron 1720 easily accomplishes a Pre Boot Assessment successfully. When it boots I see the Bios starting the system, but I wind up with a cursor on a blank screen. Left alone the screen saver comes on, but there is still no desktop visible. Is there a remedy/

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