So probably back in 2016, my dad was trying to install Norton on my Mum's Acer Aspire Timeline X computer, and it was a disk, but I realised he was installing it on the wrong account so I went to log out and go to the right account when something happened- I don't really remember now, but I do remember that when we tried to turn it on again it came up with a blue screen with a message that said something about it was corrupted. Now this year, 2018, if I turn it on it has the acer start up screen but then it goes to a black screen with just a little white dash in the top left corner (it's not flashing if that helps at all) and if you press any keys it starts to beep. The stuff on this computer is really important to me, so I would like to know how to fix this issue, and my dad won't let me take it to a repair shop because it's too expensive. Please help! Thanks so much