i put my friends pc together but he didnt order a hard disk drive because he salvaged it from an old pc. when it booted up everything was fine but the wifi wasn't working. i hooked it up to the ethernet and it still didn't work. after troubleshooting the error the universal serial bus controller wans't working or something that needed to be updated but nothing was working. so i thought something was wrong with the mother board, i put the hard disk drive in my pc to see if it would work but still same problem. i put my hard disk drive back in and now my internet and wifi won't work, no files will open. sorry this is hard to explain and i will try to post pictures of the errors when trying to trouble shott and run stuff!