Thanks for all the replies, I'll try to get all the questions answered.
IT looked at the system and could not find anything wrong. She sent the tower and only the tower.
We switched monitors and all the cables and it continued to do the same thing.
The power to the monitor does not go out. The power button is still green, not amber. The computer is still functioning when the screen goes blank. The tower is functioning as it normally would you just can't see anything.
When I say she moved the system she moved the tower, monitor and everything to the next office and she said it all worked, IT had the system and it worked as usual. There are 2 outlets in the office that the computer is normally in. The problem persisted no matter which outlet the computer/monitor was plugged into in that office. Leads me to believe it could be a problem with the outlets? Is it possible to have a problem like that? The 2 outlets are maybe 8 foot apart. I'm not an electrician so I'm not sure.
The tower isn't turning off and I was cycling the power on the monitor. It comes on for 10 seconds max then goes black. No errors.
Tomorrow I will confirm it works fine in another office. If so then we have an on-site electrician and I'll have him check the outlets. If that's not the problem I can swap the PSU out and see if that's it.
Thanks again for all the replies, really appreciate it.