monitor wont work

It's either the video card or the system board. To be sure, place the monitor at another workstation; it'll probably be fine.

Open the computer and make sure the video card is seated properly. If everything looks fine with the monitor on another computer, you might want to try the video card in the second computer as well. If both the video and monitor work in the second computer, then try the video card in another slot in your computer (if another slot is available).

The possibility that you have a memory problem is worth looking into,if the memory is not compatible w/motherboard this will cause the monitor to turn on and then blank out

Check type memory that board supports or try swithing the memeory out.

The simple (and cheapest) possability, is that the video settings are wrong for the monitor.

If the monitor is on when you turn on the PC, do you get the POST screen?

If so, neither the video card or monitor are bad.

You may need to boot into safe mode, and set the display settings to 16 color, 640*480.

Then, boot into "normal" mode, and set the resolution as desired.

Windows also may not be setting up for the correct monitor if the monitor is OFF when you boot up the system.
IfWindows detects that no monitor is connected when it is booting up and initializing drivers, it may setup a mode that is not compatable with the NEC monitor.

Chas

Hi

Is there any beeb when you start the PC? if any then check your hardware (motherboard) BIOS error codes to see what is the problem. Check your PC BIOS manufacurer site for error code or check this for major BIOS maker link
http://www.unicore.com/
There are three state for the monitor synch light:
1- Dark means that the monitor doesn't have any power or can not function. means no comunications between the PC and the monitor and no power or possiblitiy of dead monitor.
2- Amber means that either there is no detectable video signal, or that the monitor is intentionally sleeping.Your problem Usualy happen if there is a problem with the cable (unseen cut specially near the connection,visually inspect your cable for damage ) , video card (malfunctione, driver problem), refresh rate is not in the limit, and there is a magnetic or electricity near the monitor.
3- Green means that the monitor it is receiving and displaying the signal from the video card

There are many reasons that the light goes form green to amber.

1- the voltage set to 220 V but the source is 110V check both PC and monitor setting and the cable of the PC power is good replace it with another one working specially if you do not see the pc power or the hard disk light is on in general i would buy a surge suppresor and UPS to make sure that both PC and monitor get a good power source.
2- Data cable is bad (check for broken pins in the connector) or it is not connected firmily from both side disply card and mointor then check the monitor with another PC and your PC with a good working mintor with the same power cable and data cable .
3- Disply card is not set firmily in the motherboard if it is not built in.check it with another slot then check it with a working pc and place a good working disply card and try it in diffrent suitable slots (When you install the new card and if the orginal card is built in if it is not

Cost wise the monitor is the last place where you want to find the problem, it's probably not bad. If the monitor's blown and it's only 15", it'll be better to get a 17" monitor as opposed to repairing this one.

The amber light means that there's no input signal from source. But that doesn't mean that the monitor isn't bad.

Sure-fire thing to do as mentioned is connect the to another PC or connect another monitor to the PC your working on.

Is the system actually booting up? When powered you'll hear the hard drive spin up, the light on the CDROM will probably come on this just means there's power to those devices. If the light on the floppy drive comes on for a second and then goes off that's the MB testing floppy controller if that's happening the computer is booting, how far well that's another issue. Durring bootup There's normally a single beep from the system speaker letting on that so far things are OK, from there the PC will continue to boot.

As far as the video card is concerned, if it's a PCI card then yes you can try another slot. Most video cards used today are AGP and that's the slot that causes problems because the cards have a tendency to creep up in the back of the slot and lose connection. Lose memmory will also cause problems.

If you try everything and nothing works you can try resetting the BIOS by removing the battery or using the jumper provided on the system board. Instructions are in the MB book.

Fianally here is a link to troubleshooting the NEC monitor with no input signal. There's not much more there than what's been said on this forum but you may find something.

http://www.necmitsubishi.com/css/index.cfm