|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.
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 model is often also displayed on a logo (graphical) screen early in the boot, but it's often not as specific as the specific model number.
For Dell computers, they have a Service Tag number - the specific model can be determined by using that on their site, or can often be determined there automatically by you downloading some software. The Service Tag number should be on a label on the outside of the case, probably on the bottom on a laptop, on the back on a desktop, and is often also shown in the bios Setup.
NEVER unplug the monitor's video cable while the computer is running !
The power led on the monitor is one color when it's receiving no video signal, another color when it IS receiving a video signal, from it's video cable. If the video cable is not plugged into the video port on the computer, or if it is and the computer is not running, or if it is but the computer isn't producing video, the led will be the color for when it's receiving no video signal.
There is no setting or button on the monitor that will put it in sleep or suspend mode !
If the monitor does not produce a display when it's video cable is plugged into the proper video port on the computer, when the computer is running, that indicates the computer is not producing a video signal.
If the computer is not booting normally, in most cases there's nothing wrong with your monitor or the video adapter on the computer when you have no video - usually something else is wrong.
In that case, we need more description from you - tell us what the computer does and does not do, that it normally does.
It's easy enough to connect the monitor to another working computer to see if it's working - usually there's nothing wrong with it.
If the computer seems to be working okay, and you DID have a display until Windows went into a Standby or Hibernate mode, if you can't get the monitor to come out of ("wake up" from) that mode, Hold the power button on the computer inwards until the computers shuts off, then let go of it, press it again to boot the computer - if your video is normal, then you probably need to load the mboard's main chipset drivers.
If you have re-loaded Windows from scratch, Standby or Hibernate mode may not work properly until you have loaded the main chipset drivers, which include the ACPI info Windows needs to know about - how Standby, Hibernate, and Re-start are supported by the mboard.
Whenever you load Windows from a regular Windows CD (or DVD) from scratch, after Setup is finished you must load the drivers for the mboard, particularly the main chipset drivers, in order for Windows to have the proper drivers for and information about your mboard hardware, including it's AGP or PCI-E, ACPI, USB 2.0 if it has it, and hard drive controller support. If you have a generic system and have the CD that came with the mboard, all the necessary drivers are on it. If you load drivers from the web, brand name system builders and mboard makers often DO NOT have the main chipset drivers listed in the downloads for your model - in that case you must go to the maker of the main chipset's web site, get the drivers, and load them.
Load the main chipset drivers first.