I was using windows 7 legacy, but then i installed windows 10 technical preview. I think i forgot to change legacy to uefi at the time i was installing. The first step of the instalation was ok, but the first restart of the instalation got me stuck at dell logo. Even if i press f2 or f12 it does nothing, like is not working. I tried the 30sec pressing power button and connect the charger. It gives me a seven beeps infinite loop. I think i am stuck at dell logo because i didnt change to uefi at the installation. My notebook is a dell inspiron 14 3000 series 3442 a40. I bought 4 months ago
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