I turned on my hp dx 2450 pc and the screen said ''no signal input'' why?

Go into HP screen menu and turn off the display notification

Turned on computer (Pavilion a1657c), HD light operates, Monitor has little window saying:
HDMI Input: No Input Signal
VGA Input: No Input Signal
Recommended Settings: 1920x1080 - 60hz
Changed from the monitor that came with it (HP f2105 digital ouyput) to my Samsung analog and same message comes on dark screen.

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Try checking the signal strength then run the scan again.
Checking the DTV signal strength
You can check the DTV signal strength to determine if you need to adjust your antenna or digital cable input. The higher the signal strength, the less likely you are to experience picture degradation.To check the DTV signal strength:
1.Press MENU. The on-screen menu opens.

2.Press < or > to highlight Channel, then press v. The Channel menu opens. The DTV signal strength is shown at the bottom of the menu.

3.Press EXIT to close the menu.

Check the video cable connectors, remove the video connectors and reconnect them again.
Check the monitor input settings make sure the input is set to VGA and not to DVI.
Try a different monitor.

Try using "dosbox, an application to run DOS programs on windows vista/7.
plz vote 4 me

hi...if u can read " no input signal" from ur screen, this means that ur monitor is ok..
Look if u have power buttons on ur keyboard.. try to wake it from there.. some pc may have shortcut keys to bring back the pc... look @ ur pc docs on the internet for more info...
However if it's a hardware issue, it may be that ur RAM memory needs to be cleaned

If you set the PC to go to sleep after certian amount of time than it will not put out signal to the monitor. You need to go to display properties (right click on the desk top)/screen saver -power/set the display to never turn off.

that usually happens when your pc isn't turned on

monitor show "no input singnal" error masage when not gating any type of video singnal ,
so if u realy check your monitor wires for correctty plugged in .
then:-

Two possibilities:

either the video/mainboard of the monitor is defective; or
the video card/ CPU is the faulty.

A way to verify is to try the PC with another monitor or to try the monitor in another PC.

thanks

You may have the wrong type of DVI, I would try a different cable to hook it up with.