Max Bell :
DinoKiller129 :
are you using windows or linux? if you're using windows, switch to linux, it might work
Windows, how would I switch with no display?
Did it work beforehand and you have windows installed already?
Do you have any windows only applications that you need windows for?
Is it connected by HDMI or something else?
Is it connected to a TV or a Monitor?
Do you have access to another computer?
If you have access to another computer, do you have an empty CD or Flash Drive?
You can install Linux onto them by doing a simple google search and put them into the not-working PC.
Make sure that you don't delete any partitions if you do install Linux, and if you want to install windows, you can install it from the Microsoft website (https://www.microsoft.com/en-us/software-download/windows10) and download the tool to get windows, and use the repair windows when booting it.
Also if you ever need to use a windows 10 product key, you can use (TX9XD-98N7V-6WMQ6-BX7FG-H8Q99)