Monitors won't turn on

Shatto

Honorable
Mar 9, 2013
46
0
10,540
So I work at a college as a computer lab tech. Several of the monitors on our computers have stopped working, they won't turn on, the monitor power button flashes orange/amber and emits a high pitch beeping sound, They are old Dell monitors. They're running windows XP. It just seems to me like the monitor went out but without warning. So any ideas?