New computer, New monitor, but monitor won't work

Hello,
First, thank you for your help. Second, I'm new to the forum world. This is my first post, so bear with me.

My supervisor purchased a new (monster) computer for me. I run CAD programs, and possibly in the future will be running BIM software. Therefore, before purchasing the monster computer, the CAD and BIM software specs and manufacturer were consulted to ensure the new computer would service all needs. It is a wonderful computer. This supervisor also purchased two amazing monitors (Dell UltraSharp 25 Monitor with PremierColor), suggested when purchasing the computer.

The problem:
MY new OS has been downgraded by IT from Windows 10 to Windows 7 (office IT rules), and now one of the new monitors will not function properly. The monitor will work for a moment, then go blank if bumped or moved. The IT office told me every time the monitor is bumped it resets the BIOS; therefore, I cannot use one of my new monitors. Now I'm working with one good monitor, and one shitty monitor. This is liking asking someone to ride a bike with one good tire and one flat. And completely ridiculous to have a brand new monitor thrown into storage to collect dust.

IT cannot figure out how to make the new monitor to work. Their solution was to give me a lesser quality monitor and refused to figure out how to correct the problem. This attitude is not acceptable, especially when good money has been spend on very nice equipment.

I know there is a way to correct the problem. I don't have the experience or knowledge to figure this out on my own. This is why I'm asking for help. How to I get both of my monitors to function with my new computer without one of the monitors to go blank every time it is bumped or moved?

Thank you! Thank you for any and all help! It is much appreciated!

Thank you for your reply.

I have checked the connections, and I have rebooted the system. That did not fix the problem.

IT did the same procedure, with testing the connection and reboot. We did this procedure for about a week. IT then changed the lead, but when the desk was disturb by the littlest jolt, the screen would still go blank. IT explained to me that the problem is when the screen is slightly moved the BIOS in the computer is reset and the screen goes blank, which means screen only displays that connection has been lost. When this happens, I'm force to call IT to come to reconnect the screen. I understand part of the reason IT gave me about why the new screen will disconnect, but I don't understand how the old monitor works and the new cannot (at lease, they refuse to solve the problem).

Is this an issue that cannot be solved?