|"Plug for the monitor may b installed upside down. It will fit either way."|
????????? Which plug? I have no idea what seawatch1 is talking about and apparently neither does He/She.
Is the logo you mention only the monitor logo?
The No signal message means exactly that. there is no signal to the monitor.
This means there is nothing wrong with the monitor. The fact you have just moved the system may mean the graphics card has been dislodged slightly from it's socket.
Open the case and with power disconnected, re-seat the ram and graphics card.
And just so you know. There is no such thing as a HP Emachines. HP & Emachines are completely separate companies.
You also state your system is otherwise working properly. How can you tell if there is nothing on the monitor? Does it seem to fully boot and play the windows intro sound? Or are you assuming just because the fans spin, that the system is booting?
Goin' Fishin' (Some day)