My thinkpad (P51s, windows 10) crashed. Now when I start it up I see the lenovo splash screen that says to interupt normal startup, press enter. Then it will go to the boot menu (blue and gray screen with two tabs, boot menu and app menu, under boot menu my options are windows boot manager and PCI Lan, under app menu my options are Diagnostic Splash Screen and Lenovo Diagnosics). When I select windows boot manager the screen refreshes. I have run the lenovo diagnostics (took about 10 hours) and everything passed. How can i delete it all or install new OS if the only page i get is this one. Is there a backdoor to command prompt or a way out . im stuck.