I have a Dell desktop Optiplex 990 that I installed Widows 11. It was running fine until I re-started it yesterday morning. Now it only lets me into the BIOS and the only screen that does appear is a flashing dash in the upper left corner. The hard drive is working fine, I think. I have a hard drive reader, and I can access all the files. What did I do wrong and how do I fix it?
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