I also need Your OS.
making yourself nuts, test the monitor on another
PC or laptop. If you use a laptop to test the monitor and it doesn't
automatically detect an external monitor when booting, use the "F" function
keys along the top of the keyboard to tell the laptop to shift to the external
display. Remember that we are testing just to see if the monitor is live,
it doesn't matter if the screen settings are wrong and the display looks
funny. If it doesn't work on a known good computer, the problem is with the
monitor, not your PC. If a faint image is detectable on an LCD screen, the
problem is with the backlight or the inverter that powers the backlight.
A loud buzz coming from an LCD monitor is most likely the inverter circuit
failing, though it can go on getting louder for years before it pops.
the system power comes up, does the monitor
power come on? Monitors have a status LED on the front bezel that should
show green, orange, or blinking if the monitor is powered on. You can also
hear older monitors power on with a gentle sound, though I can't describe
it beyond saying it's the sound of a CRT tube warming up. Make sure the monitor
is plugged into a good outlet by testing the outlet with a lamp or any other
device that will prove beyond a doubt that the outlet is good. Make sure
that the power cord is either permanently attached at the monitor end or
that it is seated fully in the socket, since partial cord insertion is the
most common failure for monitors with detachable cords.
LCD displays don't make any sound when you turn them on, but they don't always
have a simple power cord, either. Some LCD monitors are powered by an external
transformer, which in turn is powered from a regular AC outlet. If the LCD
display doesn't show any signs of life, make sure that the cords into and
out of the transformer are fully seated. Some transformers are equipped with
a status LED to show when they are operating, though you can also check for
live output with a DC voltmeter. The power connection to the LCD display
is often awkward to inspect, recessed into the back of the display. The important
thing is to make sure it is started correctly, then seat it all the way.
you see a message on the screen that includes "power"
in it, like: "attach graphics card power", "no power to video adapter", etc,
it means that you have a PCI Express or older AGP video card that requires
more power than the motherboard can supply through the bus. This means you
need to run a power cable directly from the power supply to the video adapter,
inside the PC. If it's a new build, you may have forgotten or not seated
the connector firmly. If it was a working PC, either the power supply lead
has failed, the power supply itself has problems, the cable worked loose,
or some hardware on the video card has failed.
Earlier video cards that required additional power from the power supply
usually took a Molex connector, the same 4 pin connector used to power non-SATA
drives. Newer power supplies include one or two six pin PCI Express supplementary
connectors designed for power hungry graphics cards. Some PCI Express cards,
in the absence of a six pin supplementary lead, will accept two 4 pin Molex