Computer turns on but no display

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consolegamer - Updated on May 23, 2017 at 04:19 AM
Hello, so first my computers usb keyboard and mouse stopped working. I tried different usb's and a brand new keyboard and it still didnt work. Then trued plugging phone charger into usb and it worked fine. After that i come home one day and turn on the computer and it wont show on screen. Also i noticed the fans werent spinning and the computer was filled with dust so i blew it out with air. Still nothing was working right. Plugged xbox into the moniter and it worked fine. The computer itself is a custom made one that i bought at an auction. I dont really know anything about computers. Any ideas?