I was simply restarting my computer, fully, then my sister suddenly turned it off. I turned it back on, and did some steps to redo the reset again, then she did it AGAIN (don't ask). Now the computer is saying "no bootable device..." I've been everywhere on YouTube, but they all do the same procedure or they take out the battery or something. The screws on my laptop are like bolten on, and I can't get the screwdriver to turn it. The laptop is a Toshiba Satellite and the serial number is L551-B5271. I have had this computer since 2014. I'd really appreciate if someone could help with this problem. I feel like the only one who actually has a problem like this, but no solution seems to work.