how to use another computer as a second monitor dell

In 2009, a new version of the iMac is introduced to users, and it's the first device with Target Display Mode. Question My computer posts but the monitor does not receive signal.Ever since it was released in August 1998, the iMac becomes one of the most popular desktop computers worldwide, and it evolved into many different forms. Question Just got all the parts for a new computer, but cannot get monitor input to work I also have a second new HDMI cable so I installed that one on the XPS 8940 computer. I did use the same HDMI cable but it is a new cable. How does a USB-C cable connect to a Display port cable? I do have a display port cable and I tried that but with no success. I don't have a USB-C cable but if you think it might work I could get one. My computer doesn't have that panel anyhow. My graphics card is standard so this probably doesn't apply, but I thought I would mention it. It said if the computer has a discrete graphics card the monitor needs to be plugged in to the graphics port and not into the upper HDMI port. When I was searching online for an answer I ran across an item that said you do not use the upper HDMI port to plug in the monitor. I asked the Dell guy about that and he said that didn't come with my computer. The problem is my XPS computer does not have that horizontal panel with the 4 ports. The HDMI cable plugs into that HDMI port, not the HDMI port close to the top of the computer. It shows a horizontal panel with 4 ports, one of which is an HDMI port, located on the lower half of the XPS case on the back side. The XPS computer came with a brochure that shows how to connect the monitor.

I thought I included this in my first post but I don't see it. It looks like the monitor is expecting the the old computer with the VGA cable and there is no recognition of the HDMI cable connection. As I mentioned I used a VGA cable to connect my old computer to the monitor. When I click on that button a message flashes on the monitor 'VGA no signal'. My monitor has a button that 'selects an available input source'.

Click to expand.I did use the same HDMI cable but it is a new cable.

How to use another computer as a second monitor dell