Had the difficulty earlier than that was resolved, but it has unexpectedly returned. I cannot consider it's related, but killed my wireless keyboard transmitter. I used an old USB keyboard, and when I launched no operating system found. Hit F8 opens a DOS window that he had never seen before. I wondered how hard to find the operating system. When I prefer C, it locates the OS the machine then boots very well. Shutdown and restart and again cannot find the operating system. Disk Manager shows two hard drives as active. "Mark Partition Active" is grayed out in together. I have sprint setup a lot of times to establish repair. For all time results in:
The root cause found
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