Attempted to run chkdsk after Windows Update failed. When I restarted computer to run chkdsk, I got the black screen with the flashing "_". No pointer, if I push crtl, alt, delete, it just attempts to reboot. No other key does anything. I have removed the battery, unplugged the computer, but still get the same results. I am unable to get any boot options when pressing F8. Unable to boot from Repair disk, either. Ran diagnostics in F12, which showed all fine. What should I do next? I have no way of getting to any of my desktop.