my c0mputer screen says there is no signal

February 28, 2011 at 12:43:54
Specs: Windows XP for students
it is a desktop and i have a logitech wireless keyboard and mouse. the computer is lighting up but the screen wont come on except for a sign saying 'no signal'. is it something to do with my logitech wirelsss keyboard as somebody accidently leant on it and i am wondering if they switched something off.

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February 28, 2011 at 13:27:01
Tell us the make and model of your brand name system, or if you have a generic desktop system, the make and model of the mboard.

The specific model of a brand name system is shown on a label on the outside of the case somewhere, or it can often be determined by going to the brand name's web site and loading a program they have available, if Windows is still working, on the subject computer.

If it's a Dell computer...
Go here for how to find the Service tag "number":

Tell us what it is.

If it's a HP or Compaq computer.....
Go here:
Scroll down a bit.
Look for the similar label on the outside of your computer.
Quote the specific model number - that's at the end of the first line.
Quote the Product number - that's on the third line.

The model, sometimes the make, of a mboard in a generic desktop system is usually printed on the mboard's surface in obvious larger characters, often between the slots.

The 'no signal' message is probably generated by the monitor itself and in that case indicates the monitor works but it is not receiving a video signal. You will probably get the same message when the video cable from the monitor is not connected to a video port on the computer

A malfunctioning mouse or keyboard, alone, cannot cause that.

There are lots of things that could be wrong when you see that 'no signal' message.

Is the video cable plugged into a video port on the computer that was producing video previously ?

If you have two places you can plug in the video cable, one for the onboard video in the area where most of the ports are, another one on a plate in a slot space, usually you will get no video from the onboard video port when there is a video card in a slot - you must plug the monitor into the video port in the slot space .

If that's fine, or if that doesn't apply.....

- does the hard drive activity led blink like it usually does while booting ?
(If you normally need to Logon to Windows, the led will stop blinking shortly after the boot sequence gets to that.)

If it doesn't, you have some other problem.

Can you hear that the cpu and power supply fans spinning ?

Can you here that the hard drive(s) is(are) spinning ?

Is the power led on ?
If yes, is it the usual color, e.g. red or blue, or the standby color - e.g. yellow or orange ?

Do you hear the usual one short beep while booting the computer that you usually hear ?

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