monitor not working/dvi cable not working

[peyx_]

im gonna be honest i know nothing about pcs other than simple things like the monitor the pc itself a usb cable a dvi cable a keyboard and mouse so i need help lol. basically i went on my pc and im sure one of my family members (since alot of people are on it) messed it up somehow because when i turn the monitor on it says "dvi cable no signal". i checked to see if the dvi cable was screwed in correctly and it was, checked to see if the other side of the dvi cable was plugged in correctly to my pc and it was, and then i even swapped it out with another dvi cable and that one still didnt even work. im not sure if theres some way like a button or a switch where you can make the dvi cable just not work but im super confused and i cant get on it do to this issue since the monitor just doesnt work. if in any way someone can give me an explanation or maybe other solutions id be super grateful.

[WAWood]

@peyx_ 

I'm presuming this is a desktop, not a laptop, right?

A desktop will have one or more video jacks on the back, one of which connects the PC to a monitor.  In your case, you have the DVI jack connected and, if I am reading this right, you are no longer getting a signal on the monitor, right?

There are several possibilities that come to mind ...

First, the cable could have gone back but you said you switched cables and the monitor is still black.

Second, the monitor itself could have gone out, but if that happens, you will not get a message on the monitor, just a blank screen.

Third, if there is more than one video jack on the back of your PC case, then  the BIOS has the option of switching from one video jack to another, and someone got in there and switched jacks on you.

I have no idea what is in your BIOS settings, so I'm having to guess -- but you enter them by pressing F10 repeatedly while rebooting.  One of the screens in the settings will have a line for selecting the video output and it will have a pulldown of selections.  IF that is not pointing to the DVI option, then you need to change it.

If there are no such options, then the other possibility is that the video chip in the desktop has died -- and the problem with this is that without a video signal, you can not run diagnostics to see what has failed.  You would have to take the PC to a service facility to have them look at it to see what can be done.