Banned computer

I was just playing on minecraft and found DopeFresh's base and i wanted to raid but not get them to know that it was me so i know my friends minecraft account called UR_A_PENIS (sorry bout that) and not that account got banned my computer got banned i asjed my friend to go on my account on skype with his computer and it worked so y is it not working for me

they probably ip banned you so you cant use your computer they banned you on to play on the institution and you cant use that computer with any account on the institution so you either have to change your ip using a program or try to get un-ipbanned