Monitor Problem

Hi, I hope you are having a great day.

My eMachine hard drive failed so I purchased new one and reloade system from
restore CD. Everything came up without problem; however, when I switched back
to the eMachine monitor, or any other monitor than the one on the system when
I restored the operating system, the system would not come up. With any
monitor other than the one connected when I reloaded the OS, the blue ME
screen comes up, flashes twice and then the black screen comes up and it just
sits there. If I reconnect with monitor installed when I reloaded the system,
it comes up just fine. The usual "found new device" window does not appear
when changing monitors.

Does anyone hae a clue as to how to resolve this problem? Thanks in advance.