My MacBook does not work

I bought my MacBook from Amazon.com at USD155 last month it was all over but it was hot and I installed the refrigeration app and it increased the noise of the cooler and it kept on working but it was shutting down there getting worse and worse until it passed an antivirus and dectecto 2 virus but it had to turn it off I also blocked an unintentional file that analyzed the antivirus that after I turned it off and took hours the antivirus but did not turn on again or is gray screen and the apple and a spinning wheel try combinations of commands and nothing but the same with pendrive does not start does not choose to start the pendrive or another disk seems to me and his own is ravaged as I can do I have a USB recorder that came to work and a pendrive 16 GB AND A LAION 10.7 PURCHASED BUT I CAN NOT ACCEPT A THE MACBOOK TO DOWNLOAD IT AND INSTALL IT I WOULD LIKE TO THANK YOU A FREQUENT ANSWER FROM A LOT OF THANKS A LONG TIME AGO I WANT FOR A SOLUTION AND I DO NOT FIND IT